feat: add parameters and restructure code

integration/watermill/gtm/publisher.go

@@ -79,25 +79,12 @@ func (p *Publisher) Publish(topic string, messages ...*message.Message) error {
 			return err
 		}
 
-		values, body, err := mpv2.Marshal(event)
+		values, body, err := mpv2.Encode(event)
 		if err != nil {
 			return err
 		}
 
-		// NOTE: `richsstsse` seems to be last parameter in the query to let's ensure it stays that way
+		req, err := http.NewRequestWithContext(msg.Context(), http.MethodPost, fmt.Sprintf("%s?%s", p.url, mpv2.EncodeValues(values)), body)
-		var richsstsse bool
-		if values.Has("richsstsse") {
-			richsstsse = true
-			values.Del("richsstsse")
-		}
-
-		url := fmt.Sprintf("%s?%s", p.url, values.Encode())
-
-		if richsstsse {
-			url += "&richsstsse"
-		}
-
-		req, err := http.NewRequestWithContext(msg.Context(), http.MethodPost, url, body)
 		if err != nil {
 			return errors.Wrap(err, "failed to create request")
 		}

integration/watermill/keel/subscriber.go

@@ -138,7 +138,7 @@ func (s *Subscriber) ServeHTTP(w http.ResponseWriter, r *http.Request) {
 
 	// unmarshal event
 	var event *mpv2.Event
-	if err := mpv2.UnmarshalURLValues(values, &event); err != nil {
+	if err := mpv2.Decode(values, &event); err != nil {
 		keelhttputils.InternalServerError(l, w, r, errors.Wrap(err, "failed to marshal url values"))
 		return
 	}

measurementprotocol/v2/client.go

@@ -1,6 +1,7 @@
 package v2
 
 import (
+	"fmt"
 	"io"
 	"net/http"
 	"net/url"
@@ -129,7 +130,7 @@ func (c *Client) Send(r *http.Request, event *Event) error {
 }
 
 func (c *Client) SendRaw(r *http.Request, event *Event) error {
-	values, body, err := Marshal(event)
+	values, body, err := Encode(event)
 	if err != nil {
 		return errors.Wrap(err, "failed to marshall event")
 	}
@@ -137,7 +138,7 @@ func (c *Client) SendRaw(r *http.Request, event *Event) error {
 	req, err := http.NewRequestWithContext(
 		r.Context(),
 		http.MethodPost,
-		c.url+"?"+values.Encode(),
+		fmt.Sprintf("%s?%s", c.url, EncodeValues(values)),
 		body,
 	)
 	if err != nil {

measurementprotocol/v2/contants.go

@@ -0,0 +1,13 @@
+package v2
+
+import (
+	"regexp"
+)
+
+var (
+	RegexProduct = regexp.MustCompile(`pr([1-9]|[1-9][0-9]|1[0-9]{2}|200)`)
+)
+
+const (
+	ParameterItem = "pr"
+)

measurementprotocol/v2/data.go

@@ -0,0 +1,3 @@
+package v2
+
+type Data map[string]any

measurementprotocol/v2/decode.go

@@ -0,0 +1,98 @@
+package v2
+
+import (
+	"net/url"
+	"regexp"
+	"strings"
+
+	"github.com/mitchellh/mapstructure"
+	"github.com/pkg/errors"
+)
+
+func Decode(input url.Values, output interface{}) error {
+	data := Data{}
+
+	// decode values
+	for k, v := range input {
+		// handle maps
+		if ok, err := DecodeMapValue(k, v, data); err != nil {
+			return err
+		} else if ok {
+			continue
+		}
+
+		// handle slices
+		if ok, err := DecodeRegexValue(k, v, RegexProduct, data, ParameterItem); err != nil {
+			return err
+		} else if ok {
+			continue
+		}
+
+		// default
+		v, err := url.QueryUnescape(v[0])
+		if err != nil {
+			return err
+		}
+		data[k] = v
+	}
+
+	if err := mapstructure.WeakDecode(data, output); err != nil {
+		return errors.Wrap(err, "failed to weakly decode query")
+	}
+
+	return nil
+}
+
+func DecodeMapValue(k string, v []string, data Data) (bool, error) {
+	if strings.Contains(k, ".") {
+		parts := strings.Split(k, ".")
+		if _, ok := data[parts[0]]; !ok {
+			data[parts[0]] = map[string]any{}
+		}
+		if value, ok := data[parts[0]].(map[string]any); ok {
+			v, err := url.QueryUnescape(v[0])
+			if err != nil {
+				return false, err
+			}
+			value[strings.Join(parts[1:], ".")] = v
+		}
+		return true, nil
+	}
+	return false, nil
+}
+
+// DecodeRegexValue e.g. `pr1=idSKU_123456` = map["pr"][]map["id"]="SKU_123456"
+func DecodeRegexValue(k string, v []string, r *regexp.Regexp, data Data, key string) (bool, error) {
+	if r.MatchString(k) {
+		value, err := DecodeObjectValue(v[0])
+		if err != nil {
+			return false, err
+		}
+		if value != nil {
+			v, ok := data[key].([]map[string]any)
+			if !ok {
+				v = []map[string]any{}
+			}
+			v = append(v, value)
+			data[key] = v
+			return true, nil
+		}
+	}
+	return false, nil
+}
+
+// DecodeObjectValue e.g. `idSKU_123456` = map["id"]="SKU_123456"
+func DecodeObjectValue(s string) (map[string]any, error) {
+	if len(s) == 0 {
+		return nil, nil //nolint:nilnil
+	}
+	ret := map[string]any{}
+	for _, part := range strings.Split(s, "~") {
+		v, err := url.QueryUnescape(part[2:])
+		if err != nil {
+			return nil, err
+		}
+		ret[part[0:2]] = v
+	}
+	return ret, nil
+}

measurementprotocol/v2/decode_test.go

@@ -10,7 +10,7 @@ import (
 	"github.com/stretchr/testify/require"
 )
 
-func TestUnmarshalURLValues(t *testing.T) {
+func TestDecode(t *testing.T) {
 	tests := []struct {
 		name string
 		args string
@@ -32,48 +32,15 @@ func TestUnmarshalURLValues(t *testing.T) {
 			u, err := url.ParseQuery(tt.args)
 			require.NoError(t, err)
 			e := &mpv2.Event{}
-			if err := mpv2.UnmarshalURLValues(u, e); !assert.ErrorIs(t, err, tt.want) {
+			if err := mpv2.Decode(u, e); !assert.ErrorIs(t, err, tt.want) {
-				t.Errorf("UnmarshalURLValues() = %v, want %v", err, tt.want)
+				t.Errorf("Decode() = %v, want %v", err, tt.want)
 				t.Log(e)
 			}
 		})
 	}
 }
 
-func TestMarshalURLValues(t *testing.T) {
+func TestDecodeMapValue(t *testing.T) {
-	tests := []struct {
-		name string
-		args string
-		want error
-	}{
-		{
-			name: "page_view",
-			args: "v=2&tid=G-123456&gtm=45je42s0v893689383z8894072534za200&_p=1709286636310&gcd=13l3l3l3l1&npa=0&dma_cps=sypham&dma=1&cid=292234677.1707898933&ul=en-us&sr=3840x1600&uaa=arm&uab=64&uafvl=Chromium&uamb=0&uam=&uap=macOS&uapv=14.3.1&uaw=0&are=1&pae=1&pscdl=noapi&_s=1&sid=1709286452&sct=7&seg=1&dl=https%3A%2F%2Fwww.homemade.ch%2Fprodukt%2Fkuhn-rikon-wiegemesser-900047100%3Fid%3D900047100&dr=https%3A%2F%2Fwww.homemade.ch%2Fmesser-besteck&dt=Wiegemesser&en=page_view&tfd=5682",
-			want: nil,
-		},
-		//{
-		//	name: "add_to_cart",
-		//	args: "v=2&tid=G-123456&gtm=45je42s0v9175354889z89175348963za200&_p=1709297934217&_dbg=1&gcd=13l3l3l3l1&npa=0&dma_cps=sypham&dma=1&cid=1220643501.1708014725&ul=en-us&sr=3840x1600&_fplc=0&ur=DE-BY&uaa=arm&uab=64&uafvl=Chromium&uamb=0&uam=&uap=macOS&uapv=14.3.1&uaw=0&are=1&pscdl=noapi&_eu=IA&sst.uc=DE&sst.etld=google.de&sst.gcsub=region1&sst.gcd=13l3l3l3l1&sst.tft=1709297934217&_s=8&cu=USD&sid=1709296380&sct=7&seg=1&dl=https%3A%2F%2Fsniffer.cloud.bestbytes.net%2F%3Fgtm_debug%3D1709297933868&dr=https%3A%2F%2Ftagassistant.google.com%2F&dt=Server%20Side%20Tracking%20Prototype%20(codename%3A%20sniffer)&en=add_to_cart&pr1=idSKU_12345~nmStan%20and%20Friends%20Tee~afGoogle%20Store~cpSUMMER_FUN~ds2.22~lp5~brGoogle~caApparel~c2Adult~c3Shirts~c4Crew~c5Short%20sleeve~lirelated_products~lnRelated%20products~vagreen~loChIJIQBpAG2ahYAR_6128GcTUEo~pr10.01~qt3&epn.value=30.03&tfd=15129&richsstsse",
-		//	want: nil,
-		// },
-	}
-	for _, tt := range tests {
-		t.Run(tt.name, func(t *testing.T) {
-			u, err := url.ParseQuery(tt.args)
-			require.NoError(t, err)
-			e := &mpv2.Event{}
-			require.NoError(t, mpv2.UnmarshalURLValues(u, e))
-			if !assert.Empty(t, e.Unknown) {
-				t.Errorf("MarshalURLValues() = %v, want %v", e.Unknown, nil)
-			}
-			if out, _, err := mpv2.Marshal(e); assert.NoError(t, err) {
-				assert.EqualValues(t, u, out)
-			}
-		})
-	}
-}
-
-func TestCollect_decodeMapValue(t *testing.T) {
 	tests := []struct {
 		name string
 		args string
@@ -99,7 +66,7 @@ func TestCollect_decodeMapValue(t *testing.T) {
 			require.NoError(t, err)
 			for k, v := range values {
 				if got, err := mpv2.DecodeMapValue(k, v, d); assert.NoError(t, err) && got != tt.want {
-					t.Errorf("decodeMapValue() = %v, want %v", got, tt.want)
+					t.Errorf("DecodeMapValue() = %v, want %v", got, tt.want)
 					t.Log(d)
 				}
 			}

measurementprotocol/v2/encode.go

@@ -0,0 +1,102 @@
+package v2
+
+import (
+	"bytes"
+	"encoding/json"
+	"fmt"
+	"io"
+	"net/url"
+	"sort"
+	"strings"
+
+	"github.com/pkg/errors"
+)
+
+func Encode(input *Event) (url.Values, io.Reader, error) {
+	var richsstsse bool
+	// NOTE: `richsstsse` seems to be last parameter in the query to let's ensure it stays that way
+	if input.Richsstsse != nil {
+		richsstsse = true
+		input.Richsstsse = nil
+	}
+
+	a, err := json.Marshal(input)
+	if err != nil {
+		return nil, nil, err
+	}
+
+	data := Data{}
+	if err := json.Unmarshal(a, &data); err != nil {
+		return nil, nil, errors.Wrap(err, "failed to decode into map")
+	}
+
+	ret := url.Values{}
+	for k, v := range data {
+		switch t := v.(type) {
+		case []interface{}:
+			for key, value := range t {
+				switch tt := value.(type) {
+				case map[string]interface{}:
+					ret[fmt.Sprintf("%s%d", k, key+1)] = []string{EncodeObjectValue(tt)}
+				default:
+					panic("unhandled")
+				}
+			}
+		case map[string]string:
+			for key, value := range t {
+				ret[fmt.Sprintf("%s.%s", k, key)] = []string{value}
+			}
+		case map[string]interface{}:
+			for key, value := range t {
+				ret[fmt.Sprintf("%s.%s", k, key)] = []string{fmt.Sprintf("%v", value)}
+			}
+		case *string:
+			ret[k] = []string{*t}
+		case string:
+			ret[k] = []string{t}
+		default:
+			panic("unhandled")
+		}
+	}
+
+	var body []string
+	var reader io.Reader
+	maxQueryLength := 2048 //
+	if richsstsse {
+		maxQueryLength -= len("&richsstsse")
+	}
+	for len(ret.Encode()) > maxQueryLength {
+		for s, i := range ret {
+			ret.Del(s)
+			body = append(body, s+"="+i[0])
+			break
+		}
+	}
+
+	if richsstsse {
+		ret.Add("richsstsse", "")
+	}
+
+	if len(body) > 0 {
+		reader = bytes.NewReader([]byte(strings.Join(body, "&")))
+	}
+
+	return ret, reader, nil
+}
+
+// EncodeObjectValue e.g. `idSKU_123456` = map["id"]="SKU_123456"
+func EncodeObjectValue(s map[string]any) string {
+	if len(s) == 0 {
+		return ""
+	}
+	keys := make([]string, 0, len(s))
+	for k := range s {
+		keys = append(keys, k)
+	}
+	sort.Strings(keys)
+	ret := make([]string, 0, len(keys))
+	for _, k := range keys {
+		ret = append(ret, k+fmt.Sprintf("%s", s[k]))
+	}
+	return strings.Join(ret, "~")
+}

measurementprotocol/v2/encode_test.go

@@ -0,0 +1,43 @@
+package v2_test
+
+import (
+	"net/url"
+	"testing"
+
+	mpv2 "github.com/foomo/sesamy-go/measurementprotocol/v2"
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+)
+
+func TestEncode(t *testing.T) {
+	tests := []struct {
+		name string
+		args string
+		want error
+	}{
+		{
+			name: "page_view",
+			args: "v=2&tid=G-123456&gtm=45je42s0v893689383z8894072534za200&_p=1709286636310&gcd=13l3l3l3l1&npa=0&dma_cps=sypham&dma=1&cid=292234677.1707898933&ul=en-us&sr=3840x1600&uaa=arm&uab=64&uafvl=Chromium&uamb=0&uam=&uap=macOS&uapv=14.3.1&uaw=0&are=1&pae=1&pscdl=noapi&_s=1&sid=1709286452&sct=7&seg=1&dl=https%3A%2F%2Fwww.homemade.ch%2Fprodukt%2Fkuhn-rikon-wiegemesser-900047100%3Fid%3D900047100&dr=https%3A%2F%2Fwww.homemade.ch%2Fmesser-besteck&dt=Wiegemesser&en=page_view&tfd=5682",
+			want: nil,
+		},
+		// {
+		//	name: "add_to_cart",
+		//	args: "v=2&tid=G-123456&gtm=45je42s0v9175354889z89175348963za200&_p=1709297934217&_dbg=1&gcd=13l3l3l3l1&npa=0&dma_cps=sypham&dma=1&cid=1220643501.1708014725&ul=en-us&sr=3840x1600&_fplc=0&ur=DE-BY&uaa=arm&uab=64&uafvl=Chromium&uamb=0&uam=&uap=macOS&uapv=14.3.1&uaw=0&are=1&pscdl=noapi&_eu=IA&sst.uc=DE&sst.etld=google.de&sst.gcsub=region1&sst.gcd=13l3l3l3l1&sst.tft=1709297934217&_s=8&cu=USD&sid=1709296380&sct=7&seg=1&dl=https%3A%2F%2Fsniffer.cloud.bestbytes.net%2F%3Fgtm_debug%3D1709297933868&dr=https%3A%2F%2Ftagassistant.google.com%2F&dt=Server%20Side%20Tracking%20Prototype%20(codename%3A%20sniffer)&en=add_to_cart&pr1=idSKU_12345~nmStan%20and%20Friends%20Tee~afGoogle%20Store~cpSUMMER_FUN~ds2.22~lp5~brGoogle~caApparel~c2Adult~c3Shirts~c4Crew~c5Short%20sleeve~lirelated_products~lnRelated%20products~vagreen~loChIJIQBpAG2ahYAR_6128GcTUEo~pr10.01~qt3&epn.value=30.03&tfd=15129&richsstsse",
+		//	want: nil,
+		// },
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			u, err := url.ParseQuery(tt.args)
+			require.NoError(t, err)
+			e := &mpv2.Event{}
+			require.NoError(t, mpv2.Decode(u, e))
+			if !assert.Empty(t, e.Unknown) {
+				t.Errorf("Encode() = %v, want %v", e.Unknown, nil)
+			}
+			if out, _, err := mpv2.Encode(e); assert.NoError(t, err) {
+				assert.EqualValues(t, u, out)
+			}
+		})
+	}
+}

measurementprotocol/v2/event/addpaymentinfo.go

@@ -40,17 +40,17 @@ AddPaymentInfo https://developers.google.com/tag-platform/gtagjs/reference/event
 Query: v=2&tid=G-123456&gtm=45je42t1v9177778896z89175355532za200&_p=1709325262551&gcd=13l3l3l3l1&npa=0&dma_cps=sypham&dma=1&cid=1220643501.1708014725&ul=en-us&sr=3840x1600&_fplc=0&ur=DE-BY&uaa=arm&uab=64&uafvl=Chromium%3B122.0.6261.69%7CNot(A%253ABrand%3B24.0.0.0%7CGoogle%2520Chrome%3B122.0.6261.69&uamb=0&uam=&uap=macOS&uapv=14.3.1&uaw=0&are=1&pscdl=noapi&_eu=IA&sst.uc=DE&sst.etld=google.de&sst.gcsub=region1&sst.gcd=13l3l3l3l1&sst.tft=1709325262551&_s=5&cu=USD&sid=1709445696&sct=8&seg=0&dl=https%3A%2F%2Fsniffer.local.bestbytes.net%2F&dt=Server%20Side%20Tracking%20Prototype%20(codename%3A%20sniffer)&en=add_payment_info&_ss=1&pr1=idSKU_12345~nmStan%20and%20Friends%20Tee~afGoogle%20Store~cpSUMMER_FUN~ds2.22~lp5~brGoogle~caApparel~c2Adult~c3Shirts~c4Crew~c5Short%20sleeve~lirelated_products~lnRelated%20products~vagreen~loChIJIQBpAG2ahYAR_6128GcTUEo~pr10.01~qt3&epn.value=30.03&ep.coupon=SUMMER_FUN&ep.payment_type=Credit%20Card&tfd=120434230&richsstsse
 */
 type AddPaymentInfo struct {
-	Currency    string
+	Currency    string  `json:"currency,omitempty"`
-	Value       float64
+	Value       float64 `json:"value,omitempty"`
-	Coupon      string
+	Coupon      string  `json:"coupon,omitempty"`
-	PaymentType string
+	PaymentType string  `json:"payment_type,omitempty"`
-	Items       []*Item
+	Items       []*Item `json:"items,omitempty"`
 }
 
-func (e *AddPaymentInfo) MPv2() *mpv2.Event {
+func (e *AddPaymentInfo) MarshalMPv2() (*mpv2.Event, error) {
 	items := make([]*mpv2.Item, len(e.Items))
 	for i, item := range e.Items {
-		items[i] = item.MPv2()
+		items[i] = item.MarshalMPv2()
 	}
 	eventParameter := map[string]string{}
 	mp.AddStringMap(eventParameter, mpv2.EventParameterCoupon.String(), mp.SetString(e.Coupon))
@@ -63,5 +63,5 @@ func (e *AddPaymentInfo) MPv2() *mpv2.Event {
 		EventParameter:       mp.SetStringMap(eventParameter),
 		EventParameterNumber: mp.SetStringMap(eventParameterNumber),
 		Items:                items,
-	}
+	}, nil
 }

measurementprotocol/v2/event/addshippinginfo.go

@@ -40,17 +40,17 @@ AddShippingInfo https://developers.google.com/tag-platform/gtagjs/reference/even
 Query: v=2&tid=G-PZ5ELRCR31&gtm=45je42t1v9177778896z89175355532za220&_p=1709357665402&_dbg=1&gcd=13l3l3l3l1&npa=0&dma_cps=sypham&dma=1&cid=1220643501.1708014725&ul=en-us&sr=3840x1600&_fplc=0&ur=DE-BY&uaa=arm&uab=64&uafvl=Chromium%3B122.0.6261.69%7CNot(A%253ABrand%3B24.0.0.0%7CGoogle%2520Chrome%3B122.0.6261.69&uamb=0&uam=&uap=macOS&uapv=14.3.1&uaw=0&are=1&pscdl=noapi&_eu=IA&sst.uc=DE&sst.etld=google.de&sst.gcsub=region1&sst.gcd=13l3l3l3l1&sst.tft=1709357665402&_s=10&cu=USD&sid=1709529821&sct=9&seg=0&dl=https%3A%2F%2Fsniffer.local.bestbytes.net%2F%3Fgtm_debug%3D1709357665301&dr=https%3A%2F%2Ftagassistant.google.com%2F&dt=Server%20Side%20Tracking%20Prototype%20(codename%3A%20sniffer)&en=add_payment_info&_ss=1&pr1=idSKU_12345~nmStan%20and%20Friends%20Tee~afGoogle%20Store~cpSUMMER_FUN~ds2.22~lp5~brGoogle~caApparel~c2Adult~c3Shirts~c4Crew~c5Short%20sleeve~lirelated_products~lnRelated%20products~vagreen~loChIJIQBpAG2ahYAR_6128GcTUEo~pr10.01~qt3&epn.value=30.03&ep.coupon=SUMMER_FUN&ep.shipping_tier=Ground&tfd=137238301&richsstsse
 */
 type AddShippingInfo struct {
-	Currency     string
+	Currency     string  `json:"currency,omitempty"`
-	Value        float64
+	Value        float64 `json:"value,omitempty"`
-	Coupon       string
+	Coupon       string  `json:"coupon,omitempty"`
-	ShippingTier string
+	ShippingTier string  `json:"shipping_tier,omitempty"`
-	Items        []*Item
+	Items        []*Item `json:"items,omitempty"`
 }
 
-func (e *AddShippingInfo) MPv2() *mpv2.Event {
+func (e *AddShippingInfo) MarshalMPv2() (*mpv2.Event, error) {
 	items := make([]*mpv2.Item, len(e.Items))
 	for i, item := range e.Items {
-		items[i] = item.MPv2()
+		items[i] = item.MarshalMPv2()
 	}
 	eventParameter := map[string]string{}
 	mp.AddStringMap(eventParameter, mpv2.EventParameterCoupon.String(), mp.SetString(e.Coupon))
@@ -63,5 +63,5 @@ func (e *AddShippingInfo) MPv2() *mpv2.Event {
 		EventParameter:       mp.SetStringMap(eventParameter),
 		EventParameterNumber: mp.SetStringMap(eventParameterNumber),
 		Items:                items,
-	}
+	}, nil
 }

measurementprotocol/v2/event/addtocart.go

@@ -38,15 +38,15 @@ AddToCart https://developers.google.com/tag-platform/gtagjs/reference/events#add
 Query: v=2&tid=G-PZ5ELRCR31&gtm=45je42t1v9177778896z89175355532za200&_p=1709325262551&gcd=13l3l3l3l1&npa=0&dma_cps=sypham&dma=1&cid=1220643501.1708014725&ul=en-us&sr=3840x1600&_fplc=0&ur=DE-BY&uaa=arm&uab=64&uafvl=Chromium%3B122.0.6261.69%7CNot(A%253ABrand%3B24.0.0.0%7CGoogle%2520Chrome%3B122.0.6261.69&uamb=0&uam=&uap=macOS&uapv=14.3.1&uaw=0&are=1&pscdl=noapi&_eu=IA&sst.uc=DE&sst.etld=google.de&sst.gcsub=region1&sst.gcd=13l3l3l3l1&sst.tft=1709325262551&_s=3&cu=USD&sid=1709324719&sct=6&seg=1&dl=https%3A%2F%2Fsniffer.local.bestbytes.net%2F&dt=Server%20Side%20Tracking%20Prototype%20(codename%3A%20sniffer)&en=add_to_cart&pr1=idSKU_12345~nmStan%20and%20Friends%20Tee~afGoogle%20Store~cpSUMMER_FUN~ds2.22~lp5~brGoogle~caApparel~c2Adult~c3Shirts~c4Crew~c5Short%20sleeve~lirelated_products~lnRelated%20products~vagreen~loChIJIQBpAG2ahYAR_6128GcTUEo~pr10.01~qt3&epn.value=30.03&_et=3187&tfd=11387&richsstsse
 */
 type AddToCart struct {
-	Currency string
+	Currency string  `json:"currency,omitempty"`
-	Value    float64
+	Value    float64 `json:"value,omitempty"`
-	Items    []*Item
+	Items    []*Item `json:"items,omitempty"`
 }
 
-func (e *AddToCart) MPv2() *mpv2.Event {
+func (e *AddToCart) MarshalMPv2() (*mpv2.Event, error) {
 	items := make([]*mpv2.Item, len(e.Items))
 	for i, item := range e.Items {
-		items[i] = item.MPv2()
+		items[i] = item.MarshalMPv2()
 	}
 	eventParameterNumber := map[string]string{}
 	mp.AddStringMap(eventParameterNumber, mpv2.EventParameterNumberValue.String(), mp.SetFloat64(e.Value))
@@ -56,5 +56,5 @@ func (e *AddToCart) MPv2() *mpv2.Event {
 		EventParameterNumber: mp.SetStringMap(eventParameterNumber),
 		Items:                items,
 		Richsstsse:           mp.Set(""),
-	}
+	}, nil
 }

measurementprotocol/v2/event/addtowishlist.go

@@ -38,15 +38,15 @@ AddToWishlist https://developers.google.com/tag-platform/gtagjs/reference/events
 Query: v=2&tid=G-PZ5ELRCR31&gtm=45je42t1v9177778896z89175355532za200&_p=1709325262551&gcd=13l3l3l3l1&npa=0&dma_cps=sypham&dma=1&cid=1220643501.1708014725&ul=en-us&sr=3840x1600&_fplc=0&ur=DE-BY&uaa=arm&uab=64&uafvl=Chromium%3B122.0.6261.69%7CNot(A%253ABrand%3B24.0.0.0%7CGoogle%2520Chrome%3B122.0.6261.69&uamb=0&uam=&uap=macOS&uapv=14.3.1&uaw=0&are=1&pscdl=noapi&_eu=IA&sst.uc=DE&sst.etld=google.de&sst.gcsub=region1&sst.gcd=13l3l3l3l1&sst.tft=1709325262551&_s=3&cu=USD&sid=1709324719&sct=6&seg=1&dl=https%3A%2F%2Fsniffer.local.bestbytes.net%2F&dt=Server%20Side%20Tracking%20Prototype%20(codename%3A%20sniffer)&en=add_to_wishlist&pr1=idSKU_12345~nmStan%20and%20Friends%20Tee~afGoogle%20Store~cpSUMMER_FUN~ds2.22~lp5~brGoogle~caApparel~c2Adult~c3Shirts~c4Crew~c5Short%20sleeve~lirelated_products~lnRelated%20products~vagreen~loChIJIQBpAG2ahYAR_6128GcTUEo~pr10.01~qt3&epn.value=30.03&_et=3187&tfd=11387&richsstsse
 */
 type AddToWishlist struct {
-	Currency string
+	Currency string  `json:"currency,omitempty"`
-	Value    float64
+	Value    float64 `json:"value,omitempty"`
-	Items    []*Item
+	Items    []*Item `json:"items,omitempty"`
 }
 
-func (e *AddToWishlist) MPv2() *mpv2.Event {
+func (e *AddToWishlist) MarshalMPv2() (*mpv2.Event, error) {
 	items := make([]*mpv2.Item, len(e.Items))
 	for i, item := range e.Items {
-		items[i] = item.MPv2()
+		items[i] = item.MarshalMPv2()
 	}
 	eventParameterNumber := map[string]string{}
 	mp.AddStringMap(eventParameterNumber, mpv2.EventParameterNumberValue.String(), mp.SetFloat64(e.Value))
@@ -55,5 +55,5 @@ func (e *AddToWishlist) MPv2() *mpv2.Event {
 		Currency:             mp.SetString(e.Currency),
 		EventParameterNumber: mp.SetStringMap(eventParameterNumber),
 		Items:                items,
-	}
+	}, nil
 }

measurementprotocol/v2/event/begincheckout.go

@@ -39,16 +39,16 @@ BeginCheckout https://developers.google.com/tag-platform/gtagjs/reference/events
 Query: v=2&tid=G-123456&gtm=45je42t1v9177778896z89175355532za200&_p=1709325262551&gcd=13l3l3l3l1&npa=0&dma_cps=sypham&dma=1&cid=1220643501.1708014725&ul=en-us&sr=3840x1600&_fplc=0&ur=DE-BY&uaa=arm&uab=64&uafvl=Chromium%3B122.0.6261.69%7CNot(A%253ABrand%3B24.0.0.0%7CGoogle%2520Chrome%3B122.0.6261.69&uamb=0&uam=&uap=macOS&uapv=14.3.1&uaw=0&are=1&pscdl=noapi&_eu=IA&sst.uc=DE&sst.etld=google.de&sst.gcsub=region1&sst.gcd=13l3l3l3l1&sst.tft=1709325262551&_s=5&cu=USD&sid=1709445696&sct=8&seg=0&dl=https%3A%2F%2Fsniffer.local.bestbytes.net%2F&dt=Server%20Side%20Tracking%20Prototype%20(codename%3A%20sniffer)&en=begin_checkout&_ss=1&pr1=idSKU_12345~nmStan%20and%20Friends%20Tee~afGoogle%20Store~cpSUMMER_FUN~ds2.22~lp5~brGoogle~caApparel~c2Adult~c3Shirts~c4Crew~c5Short%20sleeve~lirelated_products~lnRelated%20products~vagreen~loChIJIQBpAG2ahYAR_6128GcTUEo~pr10.01~qt3&epn.value=30.03&ep.coupon=SUMMER_FUN&tfd=120434230&richsstsse
 */
 type BeginCheckout struct {
-	Currency string
+	Currency string  `json:"currency,omitempty"`
-	Value    float64
+	Value    float64 `json:"value,omitempty"`
-	Coupon   string
+	Coupon   string  `json:"coupon,omitempty"`
-	Items    []*Item
+	Items    []*Item `json:"items,omitempty"`
 }
 
-func (e *BeginCheckout) MPv2() *mpv2.Event {
+func (e *BeginCheckout) MarshalMPv2() (*mpv2.Event, error) {
 	items := make([]*mpv2.Item, len(e.Items))
 	for i, item := range e.Items {
-		items[i] = item.MPv2()
+		items[i] = item.MarshalMPv2()
 	}
 	eventParameter := map[string]string{}
 	mp.AddStringMap(eventParameter, mpv2.EventParameterCoupon.String(), mp.SetString(e.Coupon))
@@ -60,5 +60,5 @@ func (e *BeginCheckout) MPv2() *mpv2.Event {
 		EventParameter:       mp.SetStringMap(eventParameter),
 		EventParameterNumber: mp.SetStringMap(eventParameterNumber),
 		Items:                items,
-	}
+	}, nil
 }

measurementprotocol/v2/event/item.go

@@ -6,43 +6,43 @@ import (
 )
 
 type Item struct {
-	ID                 string
+	Affiliation   string  `json:"affiliation,omitempty"`
-	Name               string
+	Coupon        string  `json:"coupon,omitempty"`
-	Brand              string
+	Discount      float64 `json:"discount,omitempty"`
-	CategoryHierarchy1 string
+	Index         int     `json:"index,omitempty"`
-	CategoryHierarchy2 string
+	ItemBrand     string  `json:"item_brand,omitempty"`
-	CategoryHierarchy3 string
+	ItemCategory  string  `json:"item_category,omitempty"`
-	CategoryHierarchy4 string
+	ItemCategory2 string  `json:"item_category2,omitempty"`
-	CategoryHierarchy5 string
+	ItemCategory3 string  `json:"item_category3,omitempty"`
-	Price              string
+	ItemCategory4 string  `json:"item_category4,omitempty"`
-	Quantity           float64
+	ItemCategory5 string  `json:"item_category5,omitempty"`
-	Variant            string
+	ItemID        string  `json:"item_id,omitempty"`
-	Coupon             string
+	ItemListName  string  `json:"item_list_name,omitempty"`
-	Discount           float64
+	ItemName      string  `json:"item_name,omitempty"`
-	Index              int
+	ItemVariant   string  `json:"item_variant,omitempty"`
-	ListName           string
+	ItemListID    string  `json:"listId,omitempty"`
-	ListID             string
+	LocationID    string  `json:"location_id,omitempty"`
-	Affiliation        string
+	Price         string  `json:"price,omitempty"`
-	LocationID         string
+	Quantity      float64 `json:"quantity,omitempty"`
 }
 
-func (e *Item) MPv2() *mpv2.Item {
+func (e *Item) MarshalMPv2() *mpv2.Item {
 	return &mpv2.Item{
-		ID:                 mp.SetString(e.ID),
+		ID:                 mp.SetString(e.ItemID),
-		Name:               mp.SetString(e.Name),
+		Name:               mp.SetString(e.ItemName),
-		Brand:              mp.SetString(e.Brand),
+		Brand:              mp.SetString(e.ItemBrand),
-		CategoryHierarchy1: mp.SetString(e.CategoryHierarchy1),
+		CategoryHierarchy1: mp.SetString(e.ItemCategory),
-		CategoryHierarchy2: mp.SetString(e.CategoryHierarchy2),
+		CategoryHierarchy2: mp.SetString(e.ItemCategory2),
-		CategoryHierarchy3: mp.SetString(e.CategoryHierarchy3),
+		CategoryHierarchy3: mp.SetString(e.ItemCategory3),
-		CategoryHierarchy4: mp.SetString(e.CategoryHierarchy4),
+		CategoryHierarchy4: mp.SetString(e.ItemCategory4),
-		CategoryHierarchy5: mp.SetString(e.CategoryHierarchy5),
+		CategoryHierarchy5: mp.SetString(e.ItemCategory5),
 		Price:              mp.SetString(e.Price),
 		Quantity:           mp.SetFloat64(e.Quantity),
-		Variant:            mp.SetString(e.Variant),
+		Variant:            mp.SetString(e.ItemVariant),
 		Coupon:             mp.SetString(e.Coupon),
 		Discount:           mp.SetFloat64(e.Discount),
-		ListName:           mp.SetString(e.ListName),
+		ListName:           mp.SetString(e.ItemListName),
-		ListID:             mp.SetString(e.ListID),
+		ListID:             mp.SetString(e.ItemListID),
 		ListPosition:       mp.SetInt(e.Index),
 		Affiliation:        mp.SetString(e.Affiliation),
 		LocationID:         mp.SetString(e.LocationID),

measurementprotocol/v2/event/login.go

@@ -15,14 +15,14 @@ Login - Send this event to signify that a user has logged in to your website or
 Reference: https://developers.google.com/tag-platform/gtagjs/reference/events#login
 */
 type Login struct {
-	Method string
+	Method string `json:"method,omitempty"`
 }
 
-func (e *Login) MPv2() *mpv2.Event {
+func (e *Login) MarshalMPv2() (*mpv2.Event, error) {
 	eventParameter := map[string]string{}
 	mp.AddStringMap(eventParameter, mpv2.EventParameterMethod.String(), mp.SetString(e.Method))
 	return &mpv2.Event{
 		EventName:      mp.Set(mpv2.EventNameLogin),
 		EventParameter: mp.SetStringMap(eventParameter),
-	}
+	}, nil
 }

measurementprotocol/v2/event/purchase.go

@@ -42,19 +42,19 @@ Purchase https://developers.google.com/tag-platform/gtagjs/reference/events#purc
 Query: v=2&tid=G-PZ5ELRCR31&gtm=45he42t1v9177778896z89175355532za220&_p=1709537217366&_dbg=1&gcd=13l3l3l3l1&npa=0&dma_cps=sypham&dma=1&cid=1220643501.1708014725&ul=en-us&sr=3840x1600&_fplc=0&ur=&uaa=arm&uab=64&uafvl=Chromium%3B122.0.6261.69%7CNot(A%253ABrand%3B24.0.0.0%7CGoogle%2520Chrome%3B122.0.6261.69&uamb=0&uam=&uap=macOS&uapv=14.3.1&uaw=0&are=1&pscdl=noapi&_eu=IA&sst.uc=&sst.gcd=13l3l3l3l1&sst.tft=1709537217366&_s=6&cu=USD&sid=1709534872&sct=10&seg=1&dl=https%3A%2F%2Fsniffer.local.bestbytes.net%2F%3Fgtm_debug%3D1709537217296&dr=https%3A%2F%2Ftagassistant.google.com%2F&dt=Server%20Side%20Tracking%20Prototype%20(codename%3A%20sniffer)&en=purchase&_c=1&pr1=idSKU_12345~nmStan%20and%20Friends%20Tee~afGoogle%20Store~cpSUMMER_FUN~ds2.22~lp5~brGoogle~caApparel~c2Adult~c3Shirts~c4Crew~c5Short%20sleeve~lirelated_products~lnRelated%20products~vagreen~loChIJIQBpAG2ahYAR_6128GcTUEo~pr10.01~qt3&epn.value=30.03&ep.transaction_id=T_12345&ep.coupon=SUMMER_FUN&epn.shipping=3.33&epn.tax=1.11&tfd=184622&richsstsse
 */
 type Purchase struct {
-	Currency      string
+	Currency      string  `json:"currency,omitempty"`
-	Value         float64
+	Value         float64 `json:"value,omitempty"`
-	TransactionID string
+	TransactionID string  `json:"transaction_id,omitempty"`
-	Coupon        string
+	Coupon        string  `json:"coupon,omitempty"`
-	Shipping      float64
+	Shipping      float64 `json:"shipping,omitempty"`
-	Tax           float64
+	Tax           float64 `json:"tax,omitempty"`
-	Items         []*Item
+	Items         []*Item `json:"items,omitempty"`
 }
 
-func (e *Purchase) MPv2() *mpv2.Event {
+func (e *Purchase) MarshalMPv2() (*mpv2.Event, error) {
 	items := make([]*mpv2.Item, len(e.Items))
 	for i, item := range e.Items {
-		items[i] = item.MPv2()
+		items[i] = item.MarshalMPv2()
 	}
 	eventParameter := map[string]string{}
 	mp.AddStringMap(eventParameter, mpv2.EventParameterTransactionID.String(), mp.SetString(e.TransactionID))
@@ -69,5 +69,5 @@ func (e *Purchase) MPv2() *mpv2.Event {
 		EventParameter:       mp.SetStringMap(eventParameter),
 		EventParameterNumber: mp.SetStringMap(eventParameterNumber),
 		Items:                items,
-	}
+	}, nil
 }

measurementprotocol/v2/event/refund.go

@@ -42,19 +42,19 @@ Refund https://developers.google.com/tag-platform/gtagjs/reference/events#refund
 Query: v=2&tid=G-PZ5ELRCR31&gtm=45he42t1v9177778896z89175355532za220&_p=1709537217366&_dbg=1&gcd=13l3l3l3l1&npa=0&dma_cps=sypham&dma=1&cid=1220643501.1708014725&ul=en-us&sr=3840x1600&_fplc=0&ur=&uaa=arm&uab=64&uafvl=Chromium%3B122.0.6261.69%7CNot(A%253ABrand%3B24.0.0.0%7CGoogle%2520Chrome%3B122.0.6261.69&uamb=0&uam=&uap=macOS&uapv=14.3.1&uaw=0&are=1&pscdl=noapi&_eu=IA&sst.uc=&sst.gcd=13l3l3l3l1&sst.tft=1709537217366&_s=6&cu=USD&sid=1709534872&sct=10&seg=1&dl=https%3A%2F%2Fsniffer.local.bestbytes.net%2F%3Fgtm_debug%3D1709537217296&dr=https%3A%2F%2Ftagassistant.google.com%2F&dt=Server%20Side%20Tracking%20Prototype%20(codename%3A%20sniffer)&en=refund&_c=1&pr1=idSKU_12345~nmStan%20and%20Friends%20Tee~afGoogle%20Store~cpSUMMER_FUN~ds2.22~lp5~brGoogle~caApparel~c2Adult~c3Shirts~c4Crew~c5Short%20sleeve~lirelated_products~lnRelated%20products~vagreen~loChIJIQBpAG2ahYAR_6128GcTUEo~pr10.01~qt3&epn.value=30.03&ep.transaction_id=T_12345&ep.coupon=SUMMER_FUN&epn.shipping=3.33&epn.tax=1.11&tfd=184622&richsstsse
 */
 type Refund struct {
-	Currency      string
+	Currency      string  `json:"currency,omitempty"`
-	Value         float64
+	Value         float64 `json:"value,omitempty"`
-	TransactionID string
+	TransactionID string  `json:"transaction_id,omitempty"`
-	Coupon        string
+	Coupon        string  `json:"coupon,omitempty"`
-	Shipping      float64
+	Shipping      float64 `json:"shipping,omitempty"`
-	Tax           float64
+	Tax           float64 `json:"tax,omitempty"`
-	Items         []*Item
+	Items         []*Item `json:"items,omitempty"`
 }
 
-func (e *Refund) MPv2() *mpv2.Event {
+func (e *Refund) MarshalMPv2() (*mpv2.Event, error) {
 	items := make([]*mpv2.Item, len(e.Items))
 	for i, item := range e.Items {
-		items[i] = item.MPv2()
+		items[i] = item.MarshalMPv2()
 	}
 	eventParameter := map[string]string{}
 	mp.AddStringMap(eventParameter, mpv2.EventParameterTransactionID.String(), mp.SetString(e.TransactionID))
@@ -69,5 +69,5 @@ func (e *Refund) MPv2() *mpv2.Event {
 		EventParameter:       mp.SetStringMap(eventParameter),
 		EventParameterNumber: mp.SetStringMap(eventParameterNumber),
 		Items:                items,
-	}
+	}, nil
 }

measurementprotocol/v2/event/removefromcart.go

@@ -38,15 +38,15 @@ RemoveFromCart https://developers.google.com/tag-platform/gtagjs/reference/event
 Query: v=2&tid=G-PZ5ELRCR31&gtm=45je42t1v9177778896z89175355532za200&_p=1709325262551&gcd=13l3l3l3l1&npa=0&dma_cps=sypham&dma=1&cid=1220643501.1708014725&ul=en-us&sr=3840x1600&_fplc=0&ur=DE-BY&uaa=arm&uab=64&uafvl=Chromium%3B122.0.6261.69%7CNot(A%253ABrand%3B24.0.0.0%7CGoogle%2520Chrome%3B122.0.6261.69&uamb=0&uam=&uap=macOS&uapv=14.3.1&uaw=0&are=1&pscdl=noapi&_eu=IA&sst.uc=DE&sst.etld=google.de&sst.gcsub=region1&sst.gcd=13l3l3l3l1&sst.tft=1709325262551&_s=3&cu=USD&sid=1709324719&sct=6&seg=1&dl=https%3A%2F%2Fsniffer.local.bestbytes.net%2F&dt=Server%20Side%20Tracking%20Prototype%20(codename%3A%20sniffer)&en=remove_from_cart&pr1=idSKU_12345~nmStan%20and%20Friends%20Tee~afGoogle%20Store~cpSUMMER_FUN~ds2.22~lp5~brGoogle~caApparel~c2Adult~c3Shirts~c4Crew~c5Short%20sleeve~lirelated_products~lnRelated%20products~vagreen~loChIJIQBpAG2ahYAR_6128GcTUEo~pr10.01~qt3&epn.value=30.03&_et=3187&tfd=11387&richsstsse
 */
 type RemoveFromCart struct {
-	Currency string
+	Currency string  `json:"currency,omitempty"`
-	Value    float64
+	Value    float64 `json:"value,omitempty"`
-	Items    []*Item
+	Items    []*Item `json:"items,omitempty"`
 }
 
-func (e *RemoveFromCart) MPv2() *mpv2.Event {
+func (e *RemoveFromCart) MarshalMPv2() (*mpv2.Event, error) {
 	items := make([]*mpv2.Item, len(e.Items))
 	for i, item := range e.Items {
-		items[i] = item.MPv2()
+		items[i] = item.MarshalMPv2()
 	}
 	eventParameterNumber := map[string]string{}
 	mp.AddStringMap(eventParameterNumber, mpv2.EventParameterNumberValue.String(), mp.SetFloat64(e.Value))
@@ -55,5 +55,5 @@ func (e *RemoveFromCart) MPv2() *mpv2.Event {
 		Currency:             mp.SetString(e.Currency),
 		EventParameterNumber: mp.SetStringMap(eventParameterNumber),
 		Items:                items,
-	}
+	}, nil
 }

measurementprotocol/v2/event/search.go

@@ -15,14 +15,14 @@ Search https://developers.google.com/tag-platform/gtagjs/reference/events#search
 Query: v=2&tid=G-PZ5ELRCR31&gtm=45je42t1v9177778896z89175355532za200&_p=1709325262551&gcd=13l3l3l3l1&npa=0&dma_cps=sypham&dma=1&cid=1220643501.1708014725&ul=en-us&sr=3840x1600&_fplc=0&ur=DE-BY&uaa=arm&uab=64&uafvl=Chromium%3B122.0.6261.69%7CNot(A%253ABrand%3B24.0.0.0%7CGoogle%2520Chrome%3B122.0.6261.69&uamb=0&uam=&uap=macOS&uapv=14.3.1&uaw=0&are=1&pscdl=noapi&_eu=IA&sst.uc=DE&sst.etld=google.de&sst.gcsub=region1&sst.gcd=13l3l3l3l1&sst.tft=1709325262551&_s=3&cu=USD&sid=1709324719&sct=6&seg=1&dl=https%3A%2F%2Fsniffer.local.bestbytes.net%2F&dt=Server%20Side%20Tracking%20Prototype%20(codename%3A%20sniffer)&en=search&pr1=idSKU_12345~nmStan%20and%20Friends%20Tee~afGoogle%20Store~cpSUMMER_FUN~ds2.22~lp5~brGoogle~caApparel~c2Adult~c3Shirts~c4Crew~c5Short%20sleeve~lirelated_products~lnRelated%20products~vagreen~loChIJIQBpAG2ahYAR_6128GcTUEo~pr10.01~qt3&epn.value=30.03&_et=3187&tfd=11387&richsstsse
 */
 type Search struct {
-	SearchTerm string
+	SearchTerm string `json:"search_term,omitempty"`
 }
 
-func (e *Search) MPv2() *mpv2.Event {
+func (e *Search) MarshalMPv2() (*mpv2.Event, error) {
 	eventParameter := map[string]string{}
 	mp.AddStringMap(eventParameter, mpv2.EventParameterSearchTerm.String(), mp.SetString(e.SearchTerm))
 	return &mpv2.Event{
 		EventName:      mp.Set(mpv2.EventNameSearch),
 		EventParameter: mp.SetStringMap(eventParameter),
-	}
+	}, nil
 }

measurementprotocol/v2/event/signup.go

@@ -15,14 +15,14 @@ SignUp - Send this event to signify that a user has logged in to your website or
 Reference: https://developers.google.com/tag-platform/gtagjs/reference/events#sign_up
 */
 type SignUp struct {
-	Method string
+	Method string `json:"method,omitempty"`
 }
 
-func (e *SignUp) MPv2() *mpv2.Event {
+func (e *SignUp) MarshalMPv2() (*mpv2.Event, error) {
 	eventParameter := map[string]string{}
 	mp.AddStringMap(eventParameter, mpv2.EventParameterMethod.String(), mp.SetString(e.Method))
 	return &mpv2.Event{
 		EventName:      mp.Set(mpv2.EventNameSignUp),
 		EventParameter: mp.SetStringMap(eventParameter),
-	}
+	}, nil
 }

measurementprotocol/v2/eventparameter.go

@@ -1,14 +1,162 @@
 package v2
 
+// EventParameter as string
+// See https://support.google.com/analytics/table/13594742?sjid=7861230991468479976-EU
 type EventParameter string
 
 const (
+	// EventParameterAppVersion The mobile app's versionName (Android) or short bundle version (iOS) in which an event occurred
+	EventParameterAppVersion EventParameter = "app_version"
+	// EventParameterCancellationReason The reason a cancellation occurred
+	EventParameterCancellationReason EventParameter = "cancellation_reason"
+	// EventParameterFirebaseErrorValue Additional details corresponding to the error code reported by the Firebase SDK
+	EventParameterFirebaseErrorValue EventParameter = "firebase_error_value"
+	// EventParameterFirebaseScreen The current screen’s name, as provided by the developer
+	EventParameterFirebaseScreen EventParameter = "firebase_screen"
+	// EventParameterFirebaseScreenClass The current screen’s class name
+	EventParameterFirebaseScreenClass EventParameter = "firebase_screen_class"
+	// EventParameterFirebaseScreenId A random identifier for the current screen
+	EventParameterFirebaseScreenId EventParameter = "firebase_screen_id"
+	// EventParameterMessageId The Firebase Cloud Messaging or Firebase In-App Messaging message identifier, which is unique per message campaign
+	EventParameterMessageId EventParameter = "message_id"
+	// EventParameterMessageName The Firebase Cloud Messaging or Firebase In-App Messaging message name
+	EventParameterMessageName EventParameter = "message_name"
+	// EventParameterMessageType The Firebase Cloud Messaging message notification type
+	EventParameterMessageType EventParameter = "message_type"
+	// EventParameterPreviousAppVersion For the app_update event, the parameter signifies the previous application version
+	EventParameterPreviousAppVersion EventParameter = "previous_app_version"
+	// EventParameterPreviousOsVersion For the os_update event, the parameter signifies the previous OS version
+	EventParameterPreviousOsVersion EventParameter = "previous_os_version"
+	// EventParameterCampaignContent The ad content that was associated with the start of a session
+	EventParameterCampaignContent EventParameter = "campaign_content"
+	// EventParameterCampaignMedium The method for acquiring users to your website or application
+	EventParameterCampaignMedium EventParameter = "campaign_medium"
+	// EventParameterCampaignSource A representation of the publisher or inventory source from which traffic originated. For example, users who return to your website from Google Search show as "google" in the Session source dimension
+	EventParameterCampaignSource EventParameter = "campaign_source"
+	// EventParameterCampaignTerm The term that was associated with the start of a session
+	EventParameterCampaignTerm EventParameter = "campaign_term"
+	// EventParameterCoupon The coupon name or code associated with an event
+	EventParameterCoupon EventParameter = "coupon"
+	// EventParameterCurrency The currency used in an event, in 3-letter ISO 4217 format. For example, the currency used in a purchase
+	EventParameterCurrency EventParameter = "currency"
+	// EventParameterShippingTier The shipping tier selected for delivery of a purchased item
+	EventParameterShippingTier EventParameter = "shipping_tier"
+	// EventParameterTransactionId The unique identifier of a transaction
+	EventParameterTransactionId EventParameter = "transaction_id"
+	// EventParameterValue The monetary value of the event
+	EventParameterValue EventParameter = "value"
+	// EventParameterAffiliation A product affiliation to designate a supplying company or brick and mortar store location
+	EventParameterAffiliation EventParameter = "affiliation"
+	// EventParameterCreativeName The name of a creative used in a promotion. Example value: summer_banner
+	EventParameterCreativeName EventParameter = "creative_name"
+	// EventParameterCreativeSlot The name of the promotional creative slot associated with an event. Example value: featured_app_1
+	EventParameterCreativeSlot EventParameter = "creative_slot"
+	// EventParameterDiscount The value of a discount value associated with a purchased item
+	EventParameterDiscount EventParameter = "discount"
+	// EventParameterIndex The index of the item in a list
+	EventParameterIndex EventParameter = "index"
+	// EventParameterItemBrand The brand of an item
+	EventParameterItemBrand EventParameter = "item_brand"
+	// EventParameterItemCategory The category of an item. If used as part of a category hierarchy or taxonomy, then this is the first category
+	EventParameterItemCategory EventParameter = "item_category"
+	// EventParameterItemCategory2 The second hierarchical category in which you classified an item
+	EventParameterItemCategory2 EventParameter = "item_category2"
+	// EventParameterItemCategory3 The third hierarchical category in which you classified an item
+	EventParameterItemCategory3 EventParameter = "item_category3"
+	// EventParameterItemCategory4 The fourth hierarchical category in which you classified an item
+	EventParameterItemCategory4 EventParameter = "Item_category4"
+	// EventParameterItemCategory5 The fifth hierarchical category in which you classified an item
+	EventParameterItemCategory5 EventParameter = "Item_category5"
+	// EventParameterItemId The ID that you specify for an item
+	EventParameterItemId EventParameter = "item_id"
+	// EventParameterItemListId The name of the list in which an item was presented to a user
+	EventParameterItemListId EventParameter = "item_list_id"
+	// EventParameterItemListName The ID of the list in which an item was presented to a user
+	EventParameterItemListName EventParameter = "item_list_name"
+	// EventParameterItemName The name of the event that contains the parameter group
+	EventParameterItemName EventParameter = "item_name"
+	// EventParameterItemVariant The item variant or unique code or description (e.g., XS, S, M, L for size; Red, Blue, Green, Black for color) for additional item details or options
+	EventParameterItemVariant EventParameter = "item_variant"
+	// EventParameterLocationId The physical location associated with the item (e.g. the physical store location)
+	EventParameterLocationId EventParameter = "location_id"
+	// EventParameterPromotionId The ID of the promotion associated with an event
+	EventParameterPromotionId EventParameter = "promotion_id"
+	// EventParameterPromotionName The name of the promotion associated with an event
+	EventParameterPromotionName EventParameter = "promotion_name"
+	// EventParameterAchievementId The ID of an achievement that was unlocked in a game
+	EventParameterAchievementId EventParameter = "achievement_id"
+	// EventParameterCharacter The name of a character in a game
+	EventParameterCharacter EventParameter = "character"
+	// EventParameterLevelName The name of the level in a game
+	EventParameterLevelName EventParameter = "level_name"
+	// EventParameterVirtualCurrencyName The name of a virtual currency
+	EventParameterVirtualCurrencyName EventParameter = "virtual_currency_name"
+	// EventParameterFileExtension The extension of a file download
+	EventParameterFileExtension EventParameter = "file_extension"
+	// EventParameterFileName The page path of a file download
+	EventParameterFileName EventParameter = "file_name"
+	// EventParameterFormDestination The URL to which a form is being submitted
+	EventParameterFormDestination EventParameter = "form_destination"
+	// EventParameterFormId The HTML id attribution of the <form> DOM element
+	EventParameterFormId EventParameter = "form_id"
+	// EventParameterFormName The HTML name attribute of the <form> DOM element
+	EventParameterFormName EventParameter = "form_name"
+	// EventParameterFormSubmitText The text of the submit button, if present
+	EventParameterFormSubmitText EventParameter = "form_submit_text"
+	// EventParameterGroupId The ID of a group
+	EventParameterGroupId EventParameter = "group_id"
+	// EventParameterLanguage The language setting of a user’s browser or device, displayed as the ISO 639 language code
+	EventParameterLanguage EventParameter = "language"
+	// EventParameterPercentScrolled The percentage down the page that the user scrolled
+	EventParameterPercentScrolled EventParameter = "percent_scrolled"
+	// EventParameterSearchTerm The strings or keywords used in a search
+	EventParameterSearchTerm EventParameter = "search_term"
+	// EventParameterLinkClasses The HTML class attribute for an outbound link or file download
+	EventParameterLinkClasses EventParameter = "link_classes"
+	// EventParameterLinkDomain The destination domain of an outbound link or file download
+	EventParameterLinkDomain EventParameter = "link_domain"
+	// EventParameterLinkId The ID for an outbound link or file download
+	EventParameterLinkId EventParameter = "link_id"
+	// EventParameterLinkUrl The full URL for an outbound link or file download
+	EventParameterLinkUrl EventParameter = "link_url"
+	// EventParameterOutbound Indicates whether a click was on an outbound link
+	EventParameterOutbound EventParameter = "outbound"
+	// EventParameterContentGroup The content group associated with a page or screen
+	EventParameterContentGroup EventParameter = "content_group"
+	// EventParameterContentId An ID for an article of content that a user interacted with
+	EventParameterContentId EventParameter = "content_id"
+	// EventParameterContentType The type of content that a user interacted with
+	EventParameterContentType EventParameter = "content_type"
+	// EventParameterPageLocation The complete URL of the webpage that someone visited on your website
+	EventParameterPageLocation EventParameter = "page_location"
+	// EventParameterPageReferrer The referring URL, which is the user's previous URL and can be your website's domain or other domains
+	EventParameterPageReferrer EventParameter = "page_referrer"
+	// EventParameterPageTitle The HTML page title that you set on your website
+	EventParameterPageTitle EventParameter = "page_title"
+	// EventParameterScreenResolution The resolution of a device, in the format (Width)x(Height)
+	EventParameterScreenResolution EventParameter = "screen_resolution"
+	// EventParameterAdFormat The format of an advertisement in an app
+	EventParameterAdFormat EventParameter = "ad_format"
+	// EventParameterAdPlatform The platform used to surface an advertisement in an app
+	EventParameterAdPlatform EventParameter = "ad_platform"
+	// EventParameterAdSource The source network that served an advertisement
+	EventParameterAdSource EventParameter = "ad_source"
+	// EventParameterAdUnitId The unique identifier for an ad unit
+	EventParameterAdUnitId EventParameter = "ad_unit_id"
+	// EventParameterAdUnitName The name you choose for an ad unit
+	EventParameterAdUnitName EventParameter = "ad_unit_name"
+	// EventParameterVideoProvider The source of an embedded video
+	EventParameterVideoProvider EventParameter = "video_provider"
+	// EventParameterVideoTitle The title of an embedded video
+	EventParameterVideoTitle EventParameter = "video_title"
+	// EventParameterVideoUrl The url of an embedded video
+	EventParameterVideoUrl EventParameter = "video_url"
+
+	// Additional undocumented parameters
+
 	EventParameterMethod        EventParameter = "method"
-	EventParameterCoupon        EventParameter = "coupon"
 	EventParameterPaymentType   EventParameter = "payment_type"
-	EventParameterShippingTier  EventParameter = "shipping_tier"
 	EventParameterTransactionID EventParameter = "transaction_id"
-	EventParameterSearchTerm    EventParameter = "search_term"
 )
 
 func (s EventParameter) String() string {

measurementprotocol/v2/eventparamternumber.go

@@ -1,11 +1,23 @@
 package v2
 
+// EventParameterNumber as number
+// See https://support.google.com/analytics/table/13594742?sjid=7861230991468479976-EU
 type EventParameterNumber string
 
 const (
-	EventParameterNumberValue    EventParameterNumber = "value"
+	EventParameterNumberValue EventParameterNumber = "value"
+	// EventParameterNumberFirebaseError The error code reported by the Firebase SDK.
+	EventParameterNumberFirebaseError EventParameterNumber = "firebase_error"
+	// EventParameterNumberFreeTrial Signifies that an in-app purchase is a free trial
+	EventParameterNumberFreeTrial EventParameterNumber = "free_trial"
+	// EventParameterNumberMessageDeviceTime The Firebase Cloud Messaging or Firebase In-App Messaging delivery epoch timestamp in UTC.	(None)
+	EventParameterNumberMessageDeviceTime EventParameterNumber = "message_device_time"
+	// EventParameterNumberMessageTime The Firebase Cloud Messaging message notification epoch timestamp in UTC.	(None)
+	EventParameterNumberMessageTime EventParameterNumber = "message_time"
+	// EventParameterNumberShipping The shipping cost associated with a transaction
 	EventParameterNumberShipping EventParameterNumber = "shipping"
-	EventParameterNumberTax      EventParameterNumber = "tax"
+	// EventParameterNumberTax The tax cost associated with a transaction
+	EventParameterNumberTax EventParameterNumber = "tax"
 )
 
 func (s EventParameterNumber) String() string {

measurementprotocol/v2/marshaler.go

@@ -0,0 +1,5 @@
+package v2
+
+type Marshler interface {
+	MarshalMPv2() (*Event, error)
+}

measurementprotocol/v2/unmarshal.go

@@ -1,202 +0,0 @@
-package v2
-
-import (
-	"bytes"
-	"encoding/json"
-	"fmt"
-	"io"
-	"net/url"
-	"regexp"
-	"sort"
-	"strings"
-
-	"github.com/mitchellh/mapstructure"
-	"github.com/pkg/errors"
-)
-
-var (
-	RegexProduct = regexp.MustCompile(`pr([1-9]|[1-9][0-9]|1[0-9]{2}|200)`)
-)
-
-const (
-	ParameterItem = "pr"
-)
-
-type Data map[string]any
-
-func Marshal(input *Event) (url.Values, io.Reader, error) {
-	var richsstsse bool
-	// NOTE: `richsstsse` seems to be last parameter in the query to let's ensure it stays that way
-	if input.Richsstsse != nil {
-		richsstsse = true
-		input.Richsstsse = nil
-	}
-
-	a, err := json.Marshal(input)
-	if err != nil {
-		return nil, nil, err
-	}
-
-	data := Data{}
-	if err := json.Unmarshal(a, &data); err != nil {
-		return nil, nil, errors.Wrap(err, "failed to decode into map")
-	}
-
-	ret := url.Values{}
-	for k, v := range data {
-		switch t := v.(type) {
-		case []interface{}:
-			for key, value := range t {
-				switch tt := value.(type) {
-				case map[string]interface{}:
-					ret[fmt.Sprintf("%s%d", k, key+1)] = []string{EncodeObjectValue(tt)}
-				default:
-					panic("unhandled")
-				}
-			}
-		case map[string]string:
-			for key, value := range t {
-				ret[fmt.Sprintf("%s.%s", k, key)] = []string{value}
-			}
-		case map[string]interface{}:
-			for key, value := range t {
-				ret[fmt.Sprintf("%s.%s", k, key)] = []string{fmt.Sprintf("%v", value)}
-			}
-		case *string:
-			ret[k] = []string{*t}
-		case string:
-			ret[k] = []string{t}
-		default:
-			panic("unhandled")
-		}
-	}
-
-	var body []string
-	var reader io.Reader
-	maxQueryLength := 2048 //
-	if richsstsse {
-		maxQueryLength -= len("&richsstsse")
-	}
-	for len(ret.Encode()) > maxQueryLength {
-		for s, i := range ret {
-			ret.Del(s)
-			body = append(body, s+"="+i[0])
-			break
-		}
-	}
-
-	if richsstsse {
-		ret.Add("richsstsse", "")
-	}
-
-	if len(body) > 0 {
-		reader = bytes.NewReader([]byte(strings.Join(body, "&")))
-	}
-
-	return ret, reader, nil
-}
-
-func UnmarshalURLValues(input url.Values, output interface{}) error {
-	data := Data{}
-
-	// decode values
-	for k, v := range input {
-		// handle maps
-		if ok, err := DecodeMapValue(k, v, data); err != nil {
-			return err
-		} else if ok {
-			continue
-		}
-
-		// handle slices
-		if ok, err := DecodeRegexValue(k, v, RegexProduct, data, ParameterItem); err != nil {
-			return err
-		} else if ok {
-			continue
-		}
-
-		// default
-		v, err := url.QueryUnescape(v[0])
-		if err != nil {
-			return err
-		}
-		data[k] = v
-	}
-
-	if err := mapstructure.WeakDecode(data, output); err != nil {
-		return errors.Wrap(err, "failed to weakly decode query")
-	}
-
-	return nil
-}
-
-func DecodeMapValue(k string, v []string, data Data) (bool, error) {
-	if strings.Contains(k, ".") {
-		parts := strings.Split(k, ".")
-		if _, ok := data[parts[0]]; !ok {
-			data[parts[0]] = map[string]any{}
-		}
-		if value, ok := data[parts[0]].(map[string]any); ok {
-			v, err := url.QueryUnescape(v[0])
-			if err != nil {
-				return false, err
-			}
-			value[strings.Join(parts[1:], ".")] = v
-		}
-		return true, nil
-	}
-	return false, nil
-}
-
-// DecodeRegexValue e.g. `pr1=idSKU_123456` = map["pr"][]map["id"]="SKU_123456"
-func DecodeRegexValue(k string, v []string, r *regexp.Regexp, data Data, key string) (bool, error) {
-	if r.MatchString(k) {
-		value, err := DecodeObjectValue(v[0])
-		if err != nil {
-			return false, err
-		}
-		if value != nil {
-			v, ok := data[key].([]map[string]any)
-			if !ok {
-				v = []map[string]any{}
-			}
-			v = append(v, value)
-			data[key] = v
-			return true, nil
-		}
-	}
-	return false, nil
-}
-
-// DecodeObjectValue e.g. `idSKU_123456` = map["id"]="SKU_123456"
-func DecodeObjectValue(s string) (map[string]any, error) {
-	if len(s) == 0 {
-		return nil, nil //nolint:nilnil
-	}
-	ret := map[string]any{}
-	for _, part := range strings.Split(s, "~") {
-		v, err := url.QueryUnescape(part[2:])
-		if err != nil {
-			return nil, err
-		}
-		ret[part[0:2]] = v
-	}
-	return ret, nil
-}
-
-// EncodeObjectValue e.g. `idSKU_123456` = map["id"]="SKU_123456"
-func EncodeObjectValue(s map[string]any) string {
-	if len(s) == 0 {
-		return ""
-	}
-	keys := make([]string, 0, len(s))
-	for k := range s {
-		keys = append(keys, k)
-	}
-	sort.Strings(keys)
-	ret := make([]string, 0, len(keys))
-	for _, k := range keys {
-		ret = append(ret, k+fmt.Sprintf("%s", s[k]))
-	}
-	return strings.Join(ret, "~")
-}

measurementprotocol/v2/unmarshaler.go

@@ -0,0 +1,5 @@
+package v2
+
+type Unmarshler interface {
+	UnmarshalMPv2(*Event) error
+}

measurementprotocol/v2/values.go

@@ -0,0 +1,22 @@
+package v2
+
+import (
+	"net/url"
+)
+
+// EncodeValues
+// NOTE: `richsstsse` seems to be last parameter in the query to let's ensure it stays that way
+func EncodeValues(values url.Values) string {
+	var richsstsse bool
+	if values.Has("richsstsse") {
+		values.Del("richsstsse")
+		richsstsse = true
+	}
+
+	ret := values.Encode()
+
+	if richsstsse {
+		ret += "&richsstsse"
+	}
+	return ret
+}