first commit

internal/gitea/gitea.go

@@ -0,0 +1,91 @@
+// Package gitea provides a minimal Gitea API client for fetching PR diffs
+// and posting review comments.
+package gitea
+
+import (
+	"bytes"
+	"encoding/json"
+	"fmt"
+	"io"
+	"net/http"
+	"time"
+)
+
+const maxDiffBytes = 100 * 1024 // 100 KB — well within deepseek-coder's context
+
+// 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: 30 * time.Second},
+	}
+}
+
+func (c *Client) newRequest(method, url string, body []byte) (*http.Request, error) {
+	var req *http.Request
+	var err error
+	if body != nil {
+		req, err = http.NewRequest(method, url, bytes.NewReader(body))
+	} else {
+		req, err = http.NewRequest(method, url, 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
+}
+
+// FetchDiff returns the unified diff for a pull request.
+// It fetches the raw .diff endpoint and caps the result at maxDiffBytes.
+func (c *Client) FetchDiff(owner, repo string, number int) (string, error) {
+	url := fmt.Sprintf("%s/%s/%s/pulls/%d.diff", c.BaseURL, owner, repo, number)
+	req, err := c.newRequest("GET", url, nil)
+	if err != nil {
+		return "", err
+	}
+	resp, err := c.http.Do(req)
+	if err != nil {
+		return "", err
+	}
+	defer resp.Body.Close()
+	if resp.StatusCode != http.StatusOK {
+		return "", fmt.Errorf("gitea: fetch diff %s/%s#%d: %s", owner, repo, number, resp.Status)
+	}
+	b, err := io.ReadAll(io.LimitReader(resp.Body, maxDiffBytes))
+	if err != nil {
+		return "", err
+	}
+	return string(b), nil
+}
+
+// PostComment posts a comment on a pull request.
+// In Gitea, pull request comments are posted via the issues API using the PR number.
+func (c *Client) PostComment(owner, repo string, number int, body string) error {
+	url := fmt.Sprintf("%s/api/v1/repos/%s/%s/issues/%d/comments", c.BaseURL, owner, repo, number)
+	payload, _ := json.Marshal(map[string]string{"body": body})
+	req, err := c.newRequest("POST", url, payload)
+	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: post comment %s/%s#%d: %s", owner, repo, number, resp.Status)
+	}
+	return nil
+}