add(gitea-api): creation for issues, milestones and comments

This implements the post api functions for issues, milestones and
comments which are added to the gitea repository.

internal/gitea/issue.go

@@ -97,3 +97,34 @@ func (gitea *Gitea) UpdateIssue(repo Repository, issue Issue) error {
 	}
 	return nil
 }
+
+func (gitea *Gitea) NewIssue(repo Repository, issue Issue) (Issue, error) {
+	url := fmt.Sprintf("%s/repos/%s/issues", gitea.Url(), repo.Full_name)
+	var payload map[string]interface{}
+	payload["assignee"] = issue.Assignee
+	payload["assignees"] = issue.Assignees
+	payload["body"] = issue.Body
+	payload["closed"] = issue.State == "closed"
+	payload["due_date"] = issue.Due_date
+	payload["lables"] = issue.Labels
+	payload["milestone"] = issue.Milestone.Title != ""
+	payload["ref"] = issue.Ref
+	payload["title"] = issue.Title
+	json_payload, err := json.Marshal(&payload)
+	var res Issue
+	if err != nil {
+		return res, err
+	}
+	response, err := http.Post(url, "appliaction/json", bytes.NewBuffer(json_payload))
+	if err != nil {
+		return res, err
+	}
+	defer response.Body.Close()
+	decoder := json.NewDecoder(response.Body)
+	// NOTE: remove this if I do not want to store everything from the json result in the struct
+	decoder.DisallowUnknownFields() // remain if every field shall be extracted
+	if err = decoder.Decode(&res); err != nil {
+		return res, err
+	}
+	return res, nil
+}