Merge pull request #7 from mattevans/add-metadata-email-struct

feat(email): added Metadata to model

.travis.yml

@@ -1,5 +1,4 @@
 sudo: false
 language: go
 go:
-  - 1.17.x
-  - tip
+  - 1.19.x

README.md

@@ -43,6 +43,10 @@ emailReq := &postmark.Email{
   },
   Tag:        "onboarding",
   TrackOpens: true,
+  Metadata: map[string]string{
+    "client-id": "123456",
+    "client-ip": "127.0.0.1",
+  },
 }
 
 email, response, err := client.Email.Send(emailReq)
@@ -63,6 +67,10 @@ emailReq := &postmark.Email{
   TextBody:   "Hello dear Postmark user",
   Tag:        "onboarding",
   TrackOpens: true,
+  Metadata: map[string]string{
+    "client-id": "123456",
+    "client-ip": "127.0.0.1",
+  },
 }
 
 email, response, err := client.Email.Send(emailReq)

email.go

@@ -32,6 +32,7 @@ type Email struct {
 	Attachments   []EmailAttachment      `json:",omitempty"`
 	TrackOpens    bool                   `json:",omitempty"`
 	MessageStream string                 `json:",omitempty"`
+	Metadata      map[string]string      `json:",omitempty"`
 }
 
 // EmailHeader represents the values for an email header.

examples/send-email/main.go

@@ -4,7 +4,7 @@ import (
 	"fmt"
 	"net/http"
 
-	postmark "github.com/mattevans/postmark-go"
+	"github.com/mattevans/postmark-go"
 )
 
 func main() {
@@ -23,6 +23,10 @@ func main() {
 		TextBody:   "Hello dear Postmark user",
 		Tag:        "onboarding",
 		TrackOpens: true,
+		Metadata: map[string]string{
+			"client-id": "123456",
+			"client-ip": "127.0.0.1",
+		},
 	}
 
 	// Send it!

postmark.go

@@ -5,13 +5,12 @@ import (
 	"encoding/json"
 	"fmt"
 	"io"
-	"io/ioutil"
 	"net/http"
 	"net/url"
 )
 
 const (
-	packageVersion = "0.1.5"
+	packageVersion = "0.1.6"
 	backendURL     = "https://api.postmarkapp.com"
 	userAgent      = "postmark-go/" + packageVersion
 )
@@ -152,7 +151,7 @@ func CheckResponse(r *http.Response) error {
 
 	errorResponse := &ErrorResponse{Response: r}
 
-	data, err := ioutil.ReadAll(r.Body)
+	data, err := io.ReadAll(r.Body)
 	if err == nil && len(data) > 0 {
 		err := json.Unmarshal(data, errorResponse)
 		if err != nil {