add(gitea-api): issues and milestones getters

This implements the api getters for extracting the issues and milestones
for a given gitea repository. WIP for #1.

internal/gitea/issue.go

@@ -1 +1,58 @@
 package gitea
+
+import (
+	"encoding/json"
+	"fmt"
+	"net/http"
+	"time"
+)
+
+type PullRequest struct {
+	Merged    bool
+	Merged_at time.Time
+}
+
+type Issue struct {
+	Id                 uint
+	Url                string
+	Html_url           string
+	Number             uint
+	User               User
+	Original_author    string
+	Original_author_id uint
+	Title              string
+	Body               string
+	Ref                string
+	Assets             []string
+	Labels             []string
+	Milestone          Milestone
+	Assignee           User
+	Assignees          []User
+	State              string
+	Is_locked          bool
+	Comments           uint
+	Created_at         time.Time
+	Updated_at         time.Time
+	Closed_at          time.Time
+	Due_date           time.Time
+	Pull_request       PullRequest
+	Repository         Repository
+	Pin_order          uint
+}
+
+func (gitea *Gitea) GetIssues(repo Repository) ([]Issue, error) {
+	url := fmt.Sprintf("%s/repos/%s/issues?state=all", gitea.Url(), repo.Full_name)
+	response, err := http.Get(url)
+	if err != nil {
+		return nil, err
+	}
+	defer response.Body.Close()
+	var data []Issue
+	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(&data); err != nil {
+		return nil, err
+	}
+	return data, nil
+}