add a page for tickets from gitea (#2)

Co-authored-by: Blake Ridgway <blake@blakeridgway.com>
Reviewed-on: #2

internal/gitea/gitea.go

@@ -0,0 +1,191 @@
+// Package gitea provides a minimal Gitea API client for label management.
+package gitea
+
+import (
+	"bytes"
+	"encoding/json"
+	"fmt"
+	"net/http"
+	"time"
+)
+
+// Client is a minimal Gitea API client.
+type Client struct {
+	BaseURL string
+	Token   string
+	http    *http.Client
+}
+
+// New creates a new Gitea client.
+func New(baseURL, token string) *Client {
+	return &Client{
+		BaseURL: baseURL,
+		Token:   token,
+		http:    &http.Client{Timeout: 10 * time.Second},
+	}
+}
+
+// Issue represents a Gitea issue.
+type Issue struct {
+	Number  int     `json:"number"`
+	Title   string  `json:"title"`
+	HTMLURL string  `json:"html_url"`
+	Labels  []Label `json:"labels"`
+}
+
+// HasLabel reports whether the issue carries a label with the given name.
+func (i Issue) HasLabel(name string) bool {
+	for _, l := range i.Labels {
+		if l.Name == name {
+			return true
+		}
+	}
+	return false
+}
+
+// LabelID returns the ID of the first label matching name, or 0.
+func (i Issue) LabelID(name string) int64 {
+	for _, l := range i.Labels {
+		if l.Name == name {
+			return l.ID
+		}
+	}
+	return 0
+}
+
+// Label represents a Gitea label.
+type Label struct {
+	ID    int64  `json:"id"`
+	Name  string `json:"name"`
+	Color string `json:"color"`
+}
+
+func (c *Client) newRequest(method, path string, body []byte) (*http.Request, error) {
+	var req *http.Request
+	var err error
+	if body != nil {
+		req, err = http.NewRequest(method, c.BaseURL+path, bytes.NewReader(body))
+	} else {
+		req, err = http.NewRequest(method, c.BaseURL+path, nil)
+	}
+	if err != nil {
+		return nil, err
+	}
+	req.Header.Set("Authorization", "token "+c.Token)
+	if body != nil {
+		req.Header.Set("Content-Type", "application/json")
+	}
+	return req, nil
+}
+
+// ListOpenIssues returns open issues for the given owner/repo (up to 50).
+func (c *Client) ListOpenIssues(owner, repo string) ([]Issue, error) {
+	return c.listIssues(owner, repo, "")
+}
+
+// ListIssuesByLabel returns open issues that carry the named label (up to 50).
+func (c *Client) ListIssuesByLabel(owner, repo, label string) ([]Issue, error) {
+	return c.listIssues(owner, repo, label)
+}
+
+func (c *Client) listIssues(owner, repo, label string) ([]Issue, error) {
+	path := fmt.Sprintf("/api/v1/repos/%s/%s/issues?type=issues&state=open&limit=50", owner, repo)
+	if label != "" {
+		path += "&labels=" + label
+	}
+	req, err := c.newRequest("GET", path, nil)
+	if err != nil {
+		return nil, err
+	}
+	resp, err := c.http.Do(req)
+	if err != nil {
+		return nil, err
+	}
+	defer resp.Body.Close()
+	if resp.StatusCode != http.StatusOK {
+		return nil, fmt.Errorf("gitea: list issues: %s", resp.Status)
+	}
+	var issues []Issue
+	if err := json.NewDecoder(resp.Body).Decode(&issues); err != nil {
+		return nil, err
+	}
+	return issues, nil
+}
+
+// GetOrCreateLabel finds a repo label by name, creating it if absent.
+func (c *Client) GetOrCreateLabel(owner, repo, name, color string) (*Label, error) {
+	path := fmt.Sprintf("/api/v1/repos/%s/%s/labels", owner, repo)
+	req, err := c.newRequest("GET", path, nil)
+	if err != nil {
+		return nil, err
+	}
+	resp, err := c.http.Do(req)
+	if err != nil {
+		return nil, err
+	}
+	defer resp.Body.Close()
+	var labels []Label
+	json.NewDecoder(resp.Body).Decode(&labels) //nolint:errcheck
+	for _, l := range labels {
+		if l.Name == name {
+			return &l, nil
+		}
+	}
+
+	// Create the label.
+	body, _ := json.Marshal(map[string]string{"name": name, "color": color})
+	req2, err := c.newRequest("POST", path, body)
+	if err != nil {
+		return nil, err
+	}
+	resp2, err := c.http.Do(req2)
+	if err != nil {
+		return nil, err
+	}
+	defer resp2.Body.Close()
+	if resp2.StatusCode >= 300 {
+		return nil, fmt.Errorf("gitea: create label: %s", resp2.Status)
+	}
+	var label Label
+	if err := json.NewDecoder(resp2.Body).Decode(&label); err != nil {
+		return nil, err
+	}
+	return &label, nil
+}
+
+// AddLabel adds a label to an issue by label ID.
+func (c *Client) AddLabel(owner, repo string, issueNum int, labelID int64) error {
+	path := fmt.Sprintf("/api/v1/repos/%s/%s/issues/%d/labels", owner, repo, issueNum)
+	body, _ := json.Marshal(map[string][]int64{"labels": {labelID}})
+	req, err := c.newRequest("POST", path, body)
+	if err != nil {
+		return err
+	}
+	resp, err := c.http.Do(req)
+	if err != nil {
+		return err
+	}
+	defer resp.Body.Close()
+	if resp.StatusCode >= 300 {
+		return fmt.Errorf("gitea: add label: %s", resp.Status)
+	}
+	return nil
+}
+
+// RemoveLabel removes a label from an issue by label ID.
+func (c *Client) RemoveLabel(owner, repo string, issueNum int, labelID int64) error {
+	path := fmt.Sprintf("/api/v1/repos/%s/%s/issues/%d/labels/%d", owner, repo, issueNum, labelID)
+	req, err := c.newRequest("DELETE", path, nil)
+	if err != nil {
+		return err
+	}
+	resp, err := c.http.Do(req)
+	if err != nil {
+		return err
+	}
+	defer resp.Body.Close()
+	if resp.StatusCode >= 300 && resp.StatusCode != http.StatusNoContent {
+		return fmt.Errorf("gitea: remove label: %s", resp.Status)
+	}
+	return nil
+}