fix: remove trailing whitespace in action.yml

- Add --vcs-url flag as primary (reads VCS_URL env var)
- Keep --gitea-url and GITEA_URL as deprecated fallbacks with warnings
- Update action.yml: rename gitea-url input to vcs-url, pass VCS_URL to binary
- Update ci.yml: use VCS_URL env var in Run review step
- Update integration tests: INTEGRATION_GITEA_URL -> INTEGRATION_VCS_URL
- Update README: --vcs-url / VCS_URL with fallback note in env var table

Backward compat: existing GITEA_URL users get a deprecation warning and
continue to work unchanged until they migrate to VCS_URL.

.gitea/actions/review/action.yml

@@ -6,8 +6,8 @@ name: 'AI Code Review'
 description: 'Run AI-powered code review on a pull request using review-bot'
 
 inputs:
-  gitea-url:
-    description: 'Gitea instance URL (defaults to server_url)'
+  vcs-url:
+    description: 'VCS server URL (defaults to server_url)'
     required: false
     default: ''
   repo:
@@ -112,10 +112,10 @@ runs:
       id: version
       shell: bash
       run: |
-        GITEA_URL="${{ inputs.gitea-url || github.server_url }}"
+        BASE_URL="${{ inputs.vcs-url || github.server_url }}"
         REPO="${{ inputs.repo || 'rodin/review-bot' }}"
         if [ "${{ inputs.version }}" = "latest" ]; then
-          VERSION=$(curl -sSf "${GITEA_URL}/api/v1/repos/${REPO}/releases?limit=1" \
+          VERSION=$(curl -sSf "${BASE_URL}/api/v1/repos/${REPO}/releases?limit=1" \
             | python3 -c "import sys, json; releases = json.load(sys.stdin); print(releases[0]['tag_name'] if releases else '')")
           if [ -z "$VERSION" ]; then
             echo "Failed to determine latest version" >&2
@@ -137,14 +137,14 @@ runs:
       if: steps.cache.outputs.cache-hit != 'true'
       shell: bash
       run: |
-        GITEA_URL="${{ inputs.gitea-url || github.server_url }}"
+        BASE_URL="${{ inputs.vcs-url || github.server_url }}"
         REPO="${{ inputs.repo || 'rodin/review-bot' }}"
         VERSION="${{ steps.version.outputs.version }}"
         BINARY="review-bot-linux-amd64"
 
-        curl -sSfL "${GITEA_URL}/${REPO}/releases/download/${VERSION}/${BINARY}" \
+        curl -sSfL "${BASE_URL}/${REPO}/releases/download/${VERSION}/${BINARY}" \
           -o "${{ runner.temp }}/review-bot"
-        curl -sSfL "${GITEA_URL}/${REPO}/releases/download/${VERSION}/checksums.txt" \
+        curl -sSfL "${BASE_URL}/${REPO}/releases/download/${VERSION}/checksums.txt" \
           -o "${{ runner.temp }}/checksums.txt"
 
         # Verify SHA-256 checksum
@@ -169,7 +169,7 @@ runs:
     - name: Run review
       shell: bash
       env:
-        GITEA_URL: ${{ inputs.gitea-url || github.server_url }}
+        VCS_URL: ${{ inputs.vcs-url || github.server_url }}
         GITEA_REPO: ${{ inputs.repo || github.repository }}
         PR_NUMBER: ${{ inputs.pr-number || github.event.pull_request.number }}
         REVIEWER_TOKEN: ${{ inputs.reviewer-token }}

.gitea/workflows/ci.yml

@@ -49,7 +49,7 @@ jobs:
       - run: go build -o review-bot ./cmd/review-bot
       - name: Run ${{ matrix.name }} review
         env:
-          GITEA_URL: ${{ github.server_url }}
+          VCS_URL: ${{ github.server_url }}
           GITEA_REPO: ${{ github.repository }}
           PR_NUMBER: ${{ github.event.pull_request.number }}
           REVIEWER_TOKEN: ${{ secrets[matrix.token_secret] }}

PLAN-125.md

@@ -0,0 +1,175 @@
+# Plan: Issue #125 — Rename GITEA_URL → VCS_URL
+
+## Problem
+
+The `GITEA_URL` environment variable (and `--gitea-url` flag) implies the binary only works with Gitea.
+Now that review-bot supports both Gitea and GitHub/GHES, this name is misleading.
+Renaming to `VCS_URL` makes the binary platform-agnostic in its interface.
+
+## Constraints
+
+- Must not break existing users who already use `GITEA_URL` — need a fallback
+- The CLI flag `--gitea-url` should also be updated to `--vcs-url` for consistency
+- `INTEGRATION_GITEA_URL` in integration tests is a test-only env var, not the binary's interface; but should be updated for clarity
+- The action YAML uses `GITEA_URL` as an internal shell variable in bash scripts — distinct from the env var passed to the binary
+- All changes must compile and pass existing tests
+
+## Files Affected
+
+### Binary / Go source
+| File | Change |
+|------|--------|
+| `cmd/review-bot/main.go` | Rename `--gitea-url` → `--vcs-url`, add `VCS_URL` as primary, keep `GITEA_URL` fallback |
+| `cmd/review-bot/integration_test.go` | Rename `INTEGRATION_GITEA_URL` → `INTEGRATION_VCS_URL` (test-only, no external compat concern) |
+| `integration_test.go` | Same — rename `INTEGRATION_GITEA_URL` → `INTEGRATION_VCS_URL` |
+
+### Action YAML
+| File | Change |
+|------|--------|
+| `.gitea/actions/review/action.yml` | Rename input `gitea-url` → `vcs-url`; update env var passed to binary: `VCS_URL` instead of `GITEA_URL`; keep internal bash var as `GITEA_URL` (only used for release download, not passed to binary) |
+| `.gitea/workflows/ci.yml` | Rename `GITEA_URL` env var to `VCS_URL` in Run review step |
+
+### Documentation
+| File | Change |
+|------|--------|
+| `README.md` | Update CLI example, env var table entry |
+
+## Proposed Approach
+
+### 1. Backward-compatible env var lookup in main.go
+
+Replace:
+```go
+giteaURL := flag.String("gitea-url", envOrDefault("GITEA_URL", ""), "Gitea instance URL")
+```
+
+With:
+```go
+giteaURL := flag.String("vcs-url", envOrDefaultFallback("VCS_URL", "GITEA_URL", ""), "VCS server URL (e.g. https://gitea.example.com)")
+```
+
+Add a helper:
+```go
+// envOrDefaultFallback reads primary env var; if empty, falls back to deprecated env var.
+func envOrDefaultFallback(primary, deprecated, defaultVal string) string {
+    if v := os.Getenv(primary); v != "" {
+        return v
+    }
+    if v := os.Getenv(deprecated); v != "" {
+        slog.Warn("deprecated env var in use; rename to " + primary, "old", deprecated, "new", primary)
+        return v
+    }
+    return defaultVal
+}
+```
+
+**Note:** This must be called AFTER `setupLogger` conceptually, but the flag default is evaluated at flag registration time. Since `setupLogger` runs before `flag.Parse()`, the slog.Warn will print correctly at runtime. We use `log.Printf` as a fallback if this proves problematic.
+
+Actually — flag defaults are evaluated at registration (line 57), before `setupLogger`. The warning won't go through slog. Two options:
+- Use `log.Printf` for the deprecation warning (always visible)
+- Move the fallback lookup to after `flag.Parse()`, checking if the parsed value is still empty
+
+**Decision:** Move fallback to a post-parse check. This is cleaner:
+```go
+vcsURL := flag.String("vcs-url", os.Getenv("VCS_URL"), "VCS server URL")
+flag.Parse()
+// Backward compat: fall back to deprecated GITEA_URL
+if *vcsURL == "" {
+    if v := os.Getenv("GITEA_URL"); v != "" {
+        slog.Warn("GITEA_URL is deprecated; use VCS_URL instead")
+        *vcsURL = v
+    }
+}
+```
+
+This is clean, idiomatic, and the warning goes through slog correctly.
+
+### 2. Keep `--gitea-url` as deprecated alias
+
+Add a hidden flag for backward compat:
+```go
+giteaURLAlias := flag.String("gitea-url", "", "Deprecated: use --vcs-url")
+```
+
+Post-parse:
+```go
+if *vcsURL == "" && *giteaURLAlias != "" {
+    slog.Warn("--gitea-url is deprecated; use --vcs-url instead")
+    *vcsURL = *giteaURLAlias
+}
+```
+
+### 3. Internal variable rename
+
+Rename `giteaURL` local variable → `vcsURL` throughout `main.go` for consistency.
+
+### 4. Error message update
+
+```go
+fmt.Fprintf(os.Stderr, "Required: --vcs-url, --repo, --pr, --reviewer-token, --llm-model\n")
+```
+
+### 5. Action YAML changes
+
+In `.gitea/actions/review/action.yml`:
+- Input `gitea-url` → `vcs-url` (with same description, `required: false`, `default: ''`)
+- Line 172: `GITEA_URL: ${{ inputs.gitea-url || github.server_url }}` → `VCS_URL: ${{ inputs.vcs-url || github.server_url }}`
+- Lines 115, 140: internal bash vars `GITEA_URL=` are used for downloading binaries — NOT passed to the review-bot binary. Leave them as internal bash vars (they're scope-local in bash). These could be renamed to `SERVER_URL` or `BASE_URL` for local clarity, but renaming them isn't strictly required.
+
+In `.gitea/workflows/ci.yml`:
+- Line 52: `GITEA_URL: ${{ github.server_url }}` → `VCS_URL: ${{ github.server_url }}`
+
+### 6. Integration test updates
+
+`INTEGRATION_GITEA_URL` → `INTEGRATION_VCS_URL` in both test files.
+
+### 7. README
+
+- CLI example: `--gitea-url` → `--vcs-url`
+- Env var table: `GITEA_URL` → `VCS_URL`, add note about `GITEA_URL` fallback
+
+## Backward Compatibility Summary
+
+| Old | New | Fallback? |
+|-----|-----|-----------|
+| `GITEA_URL` env var | `VCS_URL` | ✅ with deprecation warning |
+| `--gitea-url` flag | `--vcs-url` | ✅ with deprecation warning |
+| `gitea-url` action input | `vcs-url` | ⚠️ No (action version bump handles this) |
+| `INTEGRATION_GITEA_URL` | `INTEGRATION_VCS_URL` | N/A (test-only) |
+
+## Error Cases
+
+- Both `VCS_URL` and `GITEA_URL` set: `VCS_URL` wins (primary takes precedence)
+- Both `--vcs-url` and `--gitea-url` provided: `--vcs-url` wins
+- Neither set: existing "missing required flags" error unchanged
+
+## Edge Cases
+
+- `os.Getenv` returns "" for unset AND set-to-empty — consistent with existing behavior
+- The `envOrDefault` helper is unchanged; we add `envOrDefaultFallback` for the one renamed var
+
+## Testing Strategy
+
+- Existing unit tests pass unchanged (they don't test env var parsing directly)
+- Integration tests updated to use new env var name
+- Manual: `GITEA_URL=https://example.com ./review-bot --repo x --pr 1 ...` should print deprecation warning and proceed
+- Manual: `VCS_URL=https://example.com ./review-bot ...` should work silently
+
+## Completion Checklist
+
+1. `VCS_URL` is read first; `GITEA_URL` is fallback with deprecation warning
+2. `--vcs-url` flag is primary; `--gitea-url` is deprecated alias with warning
+3. Error message references `--vcs-url` not `--gitea-url`
+4. `action.yml` passes `VCS_URL` (not `GITEA_URL`) to the binary
+5. `ci.yml` passes `VCS_URL` (not `GITEA_URL`) to the binary
+6. README updated in CLI example and env var table
+7. Integration tests use `INTEGRATION_VCS_URL`
+8. `go test ./...` passes
+9. `go vet ./...` passes
+10. `go build ./cmd/review-bot` succeeds
+
+## Open Questions
+
+- Should the CLI flag `--gitea-url` be completely hidden from `--help` or just deprecated with a note? The issue doesn't specify. Decision: keep it visible but add "(deprecated: use --vcs-url)" to the description.
+- Should action.yml also add `gitea-url` as a deprecated input alias? The issue says "Update the action to pass the new env var name" — no mention of backward compat for the action input. Decision: rename only, no alias (action users pin a version anyway).
+- The bash-internal `GITEA_URL` variable in action.yml scripts (used for release download, not passed to binary) — rename for clarity? Decision: yes, rename to `BASE_URL` to avoid confusion with the env var.

README.md

@@ -299,7 +299,7 @@ All flags have environment variable equivalents:
 
 | Flag | Env Var |
 |------|---------|
-| `--gitea-url` | `GITEA_URL` |
+| `--vcs-url` | `VCS_URL` (fallback: `GITEA_URL`) |
 | `--repo` | `GITEA_REPO` |
 | `--pr` | `PR_NUMBER` |
 | `--reviewer-token` | `REVIEWER_TOKEN` |

cmd/review-bot/integration_test.go

@@ -17,7 +17,7 @@ import (
 // Integration test requires a running Gitea instance and LLM endpoint.
 // Set environment variables:
 //
-//	INTEGRATION_GITEA_URL     - Gitea base URL
+//	INTEGRATION_VCS_URL       - VCS base URL
 //	INTEGRATION_GITEA_TOKEN   - Gitea API token with repo access
 //	INTEGRATION_GITEA_REPO    - owner/repo with an open PR
 //	INTEGRATION_PR_NUMBER     - PR number to test against
@@ -25,7 +25,7 @@ import (
 //	INTEGRATION_LLM_API_KEY   - LLM API key
 //	INTEGRATION_LLM_MODEL     - Model name
 func TestIntegration_FullReviewFlow(t *testing.T) {
-	giteaURL := os.Getenv("INTEGRATION_GITEA_URL")
+	giteaURL := os.Getenv("INTEGRATION_VCS_URL")
 	giteaToken := os.Getenv("INTEGRATION_GITEA_TOKEN")
 	giteaRepo := os.Getenv("INTEGRATION_GITEA_REPO")
 	prNumStr := os.Getenv("INTEGRATION_PR_NUMBER")
@@ -104,7 +104,7 @@ func TestIntegration_FullReviewFlow(t *testing.T) {
 }
 
 func TestIntegration_PostAndCleanup(t *testing.T) {
-	giteaURL := os.Getenv("INTEGRATION_GITEA_URL")
+	giteaURL := os.Getenv("INTEGRATION_VCS_URL")
 	giteaToken := os.Getenv("INTEGRATION_GITEA_TOKEN")
 	giteaRepo := os.Getenv("INTEGRATION_GITEA_REPO")
 	prNumStr := os.Getenv("INTEGRATION_PR_NUMBER")
@@ -130,7 +130,7 @@ func TestIntegration_PostAndCleanup(t *testing.T) {
 	// Post a test review
 	sentinel := "<!-- review-bot:integration-test -->"
 	testBody := "# Integration Test Review\n\nThis is a test review.\n\n" + sentinel
-	posted, err := giteaClient.PostReview(ctx, owner, repoName, prNumber, "COMMENT", testBody, nil)
+	posted, err := giteaClient.PostReview(ctx, owner, repoName, prNumber, "COMMENT", testBody, "", nil)
 	if err != nil {
 		t.Fatalf("PostReview: %v", err)
 	}

cmd/review-bot/main.go

@@ -54,7 +54,8 @@ func main() {
 	logFormat := flag.String("log-format", envOrDefault("LOG_FORMAT", "text"), "Log output format: text or json")
 	verbosity := flag.String("verbosity", envOrDefault("LOG_VERBOSITY", "info"), "Log verbosity: debug, info, warn, error")
 	// CLI flags
-	giteaURL := flag.String("gitea-url", envOrDefault("GITEA_URL", ""), "Gitea instance URL")
+	vcsURL := flag.String("vcs-url", os.Getenv("VCS_URL"), "VCS server URL (e.g. https://gitea.example.com)")
+	giteaURLAlias := flag.String("gitea-url", "", "Deprecated: use --vcs-url")
 	repo := flag.String("repo", envOrDefault("GITEA_REPO", ""), "Repository (owner/name)")
 	prNum := flag.String("pr", envOrDefault("PR_NUMBER", ""), "Pull request number")
 	reviewerName := flag.String("reviewer-name", envOrDefault("REVIEWER_NAME", ""), "Reviewer display name")
@@ -91,12 +92,24 @@ func main() {
 
 	slog.Info("review-bot starting", "version", version)
 
+	// Backward compatibility: fall back to deprecated env var / flag if VCS_URL / --vcs-url not set.
+	if *vcsURL == "" {
+		if v := os.Getenv("GITEA_URL"); v != "" {
+			slog.Warn("GITEA_URL is deprecated; rename the environment variable to VCS_URL")
+			*vcsURL = v
+		}
+	}
+	if *vcsURL == "" && *giteaURLAlias != "" {
+		slog.Warn("--gitea-url is deprecated; use --vcs-url instead")
+		*vcsURL = *giteaURLAlias
+	}
+
 	// Validate required fields
 	// For aicore provider, llm-base-url and llm-api-key are not required
 	isAICore := llm.Provider(*llmProvider) == llm.ProviderAICore
-	if *giteaURL == "" || *repo == "" || *prNum == "" || *reviewerToken == "" || *llmModel == "" {
+	if *vcsURL == "" || *repo == "" || *prNum == "" || *reviewerToken == "" || *llmModel == "" {
 		fmt.Fprintf(os.Stderr, "Error: missing required flags or environment variables\n\n")
-		fmt.Fprintf(os.Stderr, "Required: --gitea-url, --repo, --pr, --reviewer-token, --llm-model\n")
+		fmt.Fprintf(os.Stderr, "Required: --vcs-url, --repo, --pr, --reviewer-token, --llm-model\n")
 		os.Exit(1)
 	}
 	if !isAICore && (*llmBaseURL == "" || *llmAPIKey == "") {
@@ -139,7 +152,7 @@ func main() {
 	}
 
 	// Initialize clients
-	giteaClient := gitea.NewClient(*giteaURL, *reviewerToken)
+	giteaClient := gitea.NewClient(*vcsURL, *reviewerToken)
 	llmClient := llm.NewClient(*llmBaseURL, *llmAPIKey, *llmModel)
 	if *llmTemp < 0 || *llmTemp > 2 {
 		slog.Error("invalid LLM temperature", "temperature", *llmTemp, "range", "0-2")
@@ -444,7 +457,7 @@ func main() {
 
 	// POST new review
 	slog.Info("posting review", "event", event, "pr", prNumber)
-	posted, err := giteaClient.PostReview(ctx, owner, repoName, prNumber, event, reviewBody, inlineComments)
+	posted, err := giteaClient.PostReview(ctx, owner, repoName, prNumber, event, reviewBody, evaluatedSHA, inlineComments)
 	if err != nil {
 		slog.Error("failed to post review", "pr", prNumber, "event", event, "error", err)
 		os.Exit(1)
@@ -453,7 +466,7 @@ func main() {
 
 	// Supersede all old reviews with link to the new one
 	if len(oldReviews) > 0 {
-		newReviewURL := fmt.Sprintf("%s/%s/%s/pulls/%d#pullrequestreview-%d", strings.TrimRight(*giteaURL, "/"), owner, repoName, prNumber, posted.ID)
+		newReviewURL := fmt.Sprintf("%s/%s/%s/pulls/%d#pullrequestreview-%d", strings.TrimRight(*vcsURL, "/"), owner, repoName, prNumber, posted.ID)
 		for _, oldReview := range oldReviews {
 			cid, err := giteaClient.GetTimelineReviewCommentIDForReview(ctx, owner, repoName, prNumber, oldReview.ID)
 			if err != nil {

gitea/client.go

@@ -262,18 +262,22 @@ func (c *Client) GetFileContentRef(ctx context.Context, owner, repo, filepath, r
 }
 
 // PostReview submits a review to a PR and returns the created review.
-// event should be "APPROVED" or "REQUEST_CHANGES".
+// event should be one of "APPROVED", "REQUEST_CHANGES", or "COMMENT".
+// commitID anchors the review to a specific commit SHA. If empty, Gitea
+// defaults to the current PR head.
 // comments are optional inline comments attached to specific lines.
-func (c *Client) PostReview(ctx context.Context, owner, repo string, number int, event, body string, comments []ReviewComment) (*Review, error) {
+func (c *Client) PostReview(ctx context.Context, owner, repo string, number int, event, body, commitID string, comments []ReviewComment) (*Review, error) {
 	reqURL := fmt.Sprintf("%s/api/v1/repos/%s/%s/pulls/%d/reviews", c.baseURL, url.PathEscape(owner), url.PathEscape(repo), number)
 
 	payload := struct {
 		Body     string          `json:"body"`
 		Event    string          `json:"event"`
+		CommitID string          `json:"commit_id,omitempty"`
 		Comments []ReviewComment `json:"comments,omitempty"`
 	}{
 		Body:     body,
 		Event:    event,
+		CommitID: commitID,
 		Comments: comments,
 	}
 

gitea/client_test.go

@@ -117,8 +117,9 @@ func TestPostReview(t *testing.T) {
 		}
 
 		var payload struct {
-			Body  string `json:"body"`
-			Event string `json:"event"`
+			Body     string `json:"body"`
+			Event    string `json:"event"`
+			CommitID string `json:"commit_id"`
 		}
 		if err := json.NewDecoder(r.Body).Decode(&payload); err != nil {
 			t.Fatalf("failed to decode payload: %v", err)
@@ -129,14 +130,16 @@ func TestPostReview(t *testing.T) {
 		if payload.Event != "APPROVED" {
 			t.Errorf("expected event %q, got %q", "APPROVED", payload.Event)
 		}
-
+		if payload.CommitID != "abc123def" {
+			t.Errorf("expected commit_id %q, got %q", "abc123def", payload.CommitID)
+		}
 		w.WriteHeader(http.StatusOK)
 		w.Write([]byte(`{"id":100,"user":{"login":"review-bot"},"state":"APPROVED","stale":false}`))
 	}))
 	defer server.Close()
 
 	client := NewClient(server.URL, "test-token")
-	review, err := client.PostReview(context.Background(), "owner", "repo", 3, "APPROVED", "LGTM", nil)
+	review, err := client.PostReview(context.Background(), "owner", "repo", 3, "APPROVED", "LGTM", "abc123def", nil)
 	if err != nil {
 		t.Fatalf("unexpected error: %v", err)
 	}
@@ -183,12 +186,35 @@ func TestPostReview_Non200(t *testing.T) {
 	defer server.Close()
 
 	client := NewClient(server.URL, "test-token")
-	_, err := client.PostReview(context.Background(), "owner", "repo", 1, "APPROVED", "test", nil)
+	_, err := client.PostReview(context.Background(), "owner", "repo", 1, "APPROVED", "test", "", nil)
 	if err == nil {
 		t.Fatal("expected error for 403, got nil")
 	}
 }
 
+func TestPostReview_EmptyCommitID_OmittedFromPayload(t *testing.T) {
+	server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		body, _ := io.ReadAll(r.Body)
+		var raw map[string]interface{}
+		if err := json.Unmarshal(body, &raw); err != nil {
+			t.Fatalf("failed to decode payload: %v", err)
+		}
+		if _, exists := raw["commit_id"]; exists {
+			t.Errorf("expected commit_id to be omitted from payload when empty, but it was present")
+		}
+
+		w.WriteHeader(http.StatusOK)
+		w.Write([]byte(`{"id":200,"user":{"login":"bot"},"state":"APPROVED","stale":false}`))
+	}))
+	defer server.Close()
+
+	client := NewClient(server.URL, "test-token")
+	_, err := client.PostReview(context.Background(), "owner", "repo", 1, "APPROVED", "ok", "", nil)
+	if err != nil {
+		t.Fatalf("unexpected error: %v", err)
+	}
+}
+
 func TestGetFileContent(t *testing.T) {
 	expected := "# Conventions\n- Be nice\n"
 
@@ -945,8 +971,6 @@ func TestDoGet_RespectsContextCancellation(t *testing.T) {
 		t.Errorf("attempts = %d, expected 1 before context cancel during backoff", attempts)
 	}
 }
-
-
 // mockTransport is a test helper that returns errors for the first N calls,
 // then delegates to a real server.
 type mockTransport struct {

gitea/post_review_comments_test.go

@@ -37,7 +37,7 @@ func TestPostReview_WithComments(t *testing.T) {
 		{Path: "util.go", NewPosition: 10, Body: "[MINOR] Style issue"},
 	}
 
-	_, err := client.PostReview(context.Background(), "owner", "repo", 1, "REQUEST_CHANGES", "summary", comments)
+	_, err := client.PostReview(context.Background(), "owner", "repo", 1, "REQUEST_CHANGES", "summary", "", comments)
 	if err != nil {
 		t.Fatalf("unexpected error: %v", err)
 	}
@@ -72,7 +72,7 @@ func TestPostReview_NilComments(t *testing.T) {
 	defer server.Close()
 
 	client := NewClient(server.URL, "test-token")
-	_, err := client.PostReview(context.Background(), "owner", "repo", 1, "APPROVED", "all good", nil)
+	_, err := client.PostReview(context.Background(), "owner", "repo", 1, "APPROVED", "all good", "", nil)
 	if err != nil {
 		t.Fatalf("unexpected error: %v", err)
 	}

github/client.go

@@ -8,7 +8,10 @@ import (
 	"errors"
 	"fmt"
 	"io"
+	"log/slog"
 	"net/http"
+	"net/url"
+	"os"
 	"strconv"
 	"strings"
 	"time"
@@ -93,10 +96,14 @@ type Client struct {
 	// Higher-level exported methods (GetPullRequest, etc.) will use it to
 	// construct request URLs; remove this field if those methods end up
 	// accepting full URLs instead.
-	baseURL string
-	token   string
+	baseURL    string
+	token      string
 	httpClient *http.Client
 
+	// allowInsecureHTTP permits requests to HTTP (non-TLS) endpoints.
+	// When false, doRequest rejects URLs with an http:// scheme.
+	allowInsecureHTTP bool
+
 	// retryBackoff defines the delays between retry attempts for 429 responses.
 	// retryBackoff[i] is the delay before attempt i+1 (after attempt i fails).
 	// If nil, defaults to {1s, 2s}.
@@ -135,16 +142,53 @@ func defaultCheckRedirect(req *http.Request, via []*http.Request) error {
 	return nil
 }
 
+// ClientOption configures optional behavior of a Client.
+type ClientOption func(*clientConfig)
+
+type clientConfig struct {
+	allowInsecureHTTP    bool
+	insecureIsTestBypass bool
+}
+
+// AllowInsecureHTTP permits sending credentials over plaintext HTTP connections.
+// In production, this option is gated by the REVIEW_BOT_ALLOW_INSECURE=1
+// environment variable. Without the env var set, the option is ignored
+// and a warning is logged.
+//
+// For tests, use AllowInsecureHTTPForTest (defined in a _test.go file in the same package) which bypasses the env gate.
+func AllowInsecureHTTP() ClientOption {
+	return func(cfg *clientConfig) {
+		cfg.allowInsecureHTTP = true
+	}
+}
+
 // NewClient creates a new GitHub API client.
 // If baseURL is empty, it defaults to https://api.github.com.
 // For GitHub Enterprise, pass the API base URL (e.g. https://github.concur.com/api/v3).
-func NewClient(token, baseURL string) *Client {
+func NewClient(token, baseURL string, opts ...ClientOption) *Client {
 	if baseURL == "" {
 		baseURL = defaultBaseURL
 	}
+
+	var cfg clientConfig
+	for _, opt := range opts {
+		opt(&cfg)
+	}
+
+	if cfg.allowInsecureHTTP && !cfg.insecureIsTestBypass {
+		if os.Getenv("REVIEW_BOT_ALLOW_INSECURE") != "1" {
+			slog.Warn("AllowInsecureHTTP ignored: set REVIEW_BOT_ALLOW_INSECURE=1 to enable")
+			cfg.allowInsecureHTTP = false
+		} else {
+			slog.Warn("AllowInsecureHTTP enabled — credentials may be sent over plaintext",
+				"env", "REVIEW_BOT_ALLOW_INSECURE=1")
+		}
+	}
+
 	return &Client{
-		baseURL: strings.TrimRight(baseURL, "/"),
-		token:   token,
+		baseURL:           strings.TrimRight(baseURL, "/"),
+		token:             token,
+		allowInsecureHTTP: cfg.allowInsecureHTTP,
 		httpClient: &http.Client{
 			Timeout:       30 * time.Second,
 			CheckRedirect: defaultCheckRedirect,
@@ -215,10 +259,39 @@ func (c *Client) parseRetryAfter(value string) (time.Duration, bool) {
 	return 0, false
 }
 
+// redactURL redacts sensitive components from a URL for safe inclusion in error
+// messages and log output. It removes userinfo (e.g., user:pass@) and replaces
+// query parameters with a placeholder.
+func redactURL(rawURL string) string {
+	u, err := url.Parse(rawURL)
+	if err != nil {
+		return "<unparseable URL>"
+	}
+	u.User = nil
+
+	if u.RawQuery != "" {
+		u.RawQuery = "<redacted>"
+	}
+	return u.String()
+}
+
 // doRequest performs an HTTP request with retry on 429 rate limit responses.
 // It respects the Retry-After header when present, supporting both integer
 // seconds and HTTP-date formats (capped at maxRetryAfter).
 func (c *Client) doRequest(ctx context.Context, method, reqURL string, accept string) ([]byte, error) {
+	// NOTE: This parses reqURL a second time (http.NewRequestWithContext parses it
+	// again internally). Acceptable cost: URL parsing is cheap and threading the
+	// parsed *url.URL through would complicate the interface for negligible gain.
+	if !c.allowInsecureHTTP {
+		parsed, err := url.Parse(reqURL)
+		if err != nil {
+			return nil, fmt.Errorf("parse request URL: %w", err)
+		}
+		if strings.EqualFold(parsed.Scheme, "http") {
+			return nil, fmt.Errorf("refusing HTTP request to %s: use HTTPS or set AllowInsecureHTTP option", redactURL(reqURL))
+		}
+	}
+
 	var backoff []time.Duration
 	if c.retryBackoff != nil {
 		backoff = append([]time.Duration(nil), c.retryBackoff...)
@@ -237,7 +310,7 @@ func (c *Client) doRequest(ctx context.Context, method, reqURL string, accept st
 				timer := time.NewTimer(delay)
 				select {
 				case <-timer.C:
-					timer.Stop()
+					timer.Stop() // no-op after fire; kept for symmetry with the ctx.Done case
 				case <-ctx.Done():
 					timer.Stop()
 					return nil, ctx.Err()

github/client_test.go

@@ -35,7 +35,7 @@ func TestDoRequest_Success(t *testing.T) {
 	}))
 	defer srv.Close()
 
-	c := NewClient("test-token", srv.URL)
+	c := NewClient("test-token", srv.URL, AllowInsecureHTTPForTest())
 	body, err := c.doGet(context.Background(), srv.URL+"/test")
 	if err != nil {
 		t.Fatalf("unexpected error: %v", err)
@@ -60,7 +60,7 @@ func TestDoRequest_429_RetryAfter_IntegerSeconds(t *testing.T) {
 	}))
 	defer srv.Close()
 
-	c := NewClient("tok", srv.URL)
+	c := NewClient("tok", srv.URL, AllowInsecureHTTPForTest())
 	c.SetRetryBackoff([]time.Duration{0, 0})
 
 	body, err := c.doGet(context.Background(), srv.URL+"/test")
@@ -94,7 +94,7 @@ func TestDoRequest_429_RetryAfter_HTTPDate(t *testing.T) {
 	}))
 	defer srv.Close()
 
-	c := NewClient("tok", srv.URL)
+	c := NewClient("tok", srv.URL, AllowInsecureHTTPForTest())
 	c.now = func() time.Time { return fixedNow }
 	// Initial backoff is 0; the HTTP-date parser will compute 1s and override.
 	c.SetRetryBackoff([]time.Duration{0, 0})
@@ -130,7 +130,7 @@ func TestDoRequest_429_RetryAfter_HTTPDate_InPast(t *testing.T) {
 	}))
 	defer srv.Close()
 
-	c := NewClient("tok", srv.URL)
+	c := NewClient("tok", srv.URL, AllowInsecureHTTPForTest())
 	c.now = func() time.Time { return fixedNow }
 	c.SetRetryBackoff([]time.Duration{0, 0})
 
@@ -157,7 +157,7 @@ func TestDoRequest_429_NoRetryAfter_UsesDefaultBackoff(t *testing.T) {
 	}))
 	defer srv.Close()
 
-	c := NewClient("tok", srv.URL)
+	c := NewClient("tok", srv.URL, AllowInsecureHTTPForTest())
 	c.SetRetryBackoff([]time.Duration{0, 0})
 
 	body, err := c.doGet(context.Background(), srv.URL+"/test")
@@ -187,7 +187,7 @@ func TestDoRequest_429_InvalidRetryAfter_UsesDefaultBackoff(t *testing.T) {
 	}))
 	defer srv.Close()
 
-	c := NewClient("tok", srv.URL)
+	c := NewClient("tok", srv.URL, AllowInsecureHTTPForTest())
 	c.SetRetryBackoff([]time.Duration{0, 0})
 
 	body, err := c.doGet(context.Background(), srv.URL+"/test")
@@ -208,7 +208,7 @@ func TestDoRequest_404_NoRetry(t *testing.T) {
 	}))
 	defer srv.Close()
 
-	c := NewClient("tok", srv.URL)
+	c := NewClient("tok", srv.URL, AllowInsecureHTTPForTest())
 	_, err := c.doGet(context.Background(), srv.URL+"/test")
 	if err == nil {
 		t.Fatal("expected error, got nil")
@@ -230,7 +230,7 @@ func TestDoRequest_401_NoRetry(t *testing.T) {
 	}))
 	defer srv.Close()
 
-	c := NewClient("tok", srv.URL)
+	c := NewClient("tok", srv.URL, AllowInsecureHTTPForTest())
 	_, err := c.doGet(context.Background(), srv.URL+"/test")
 	if err == nil {
 		t.Fatal("expected error, got nil")
@@ -260,7 +260,7 @@ func TestDoRequest_ContextCanceled(t *testing.T) {
 	}))
 	defer srv.Close()
 
-	c := NewClient("tok", srv.URL)
+	c := NewClient("tok", srv.URL, AllowInsecureHTTPForTest())
 	c.SetRetryBackoff([]time.Duration{10 * time.Second, 10 * time.Second})
 
 	ctx, cancel := context.WithCancel(context.Background())
@@ -511,3 +511,148 @@ func TestSetHTTPClient_NilRestoresDefault(t *testing.T) {
 		t.Fatal("expected CheckRedirect policy after SetHTTPClient(nil)")
 	}
 }
+
+func TestAllowInsecureHTTPForTest_PermitsHTTP(t *testing.T) {
+	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		w.WriteHeader(http.StatusOK)
+		w.Write([]byte("ok"))
+	}))
+	defer srv.Close()
+
+	c := NewClient("tok", srv.URL, AllowInsecureHTTPForTest())
+	body, err := c.doGet(context.Background(), srv.URL+"/test")
+	if err != nil {
+		t.Fatalf("unexpected error: %v", err)
+	}
+	if string(body) != "ok" {
+		t.Errorf("body = %q, want %q", body, "ok")
+	}
+}
+
+func TestNoInsecureOption_RejectsHTTP(t *testing.T) {
+	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		t.Fatal("request should not have been sent")
+	}))
+	defer srv.Close()
+
+	c := NewClient("tok", srv.URL)
+	_, err := c.doGet(context.Background(), srv.URL+"/test")
+	if err == nil {
+		t.Fatal("expected error for HTTP request without AllowInsecureHTTP")
+	}
+	if !strings.Contains(err.Error(), "refusing HTTP request") {
+		t.Errorf("unexpected error message: %v", err)
+	}
+}
+
+func TestNoInsecureOption_RejectsUppercaseHTTP(t *testing.T) {
+	// Verify case-insensitive scheme check (RFC 3986).
+	c := NewClient("tok", "HTTP://127.0.0.1:1")
+	_, err := c.doGet(context.Background(), "HTTP://127.0.0.1:1/test")
+	if err == nil {
+		t.Fatal("expected error for uppercase HTTP scheme")
+	}
+	if !strings.Contains(err.Error(), "refusing HTTP request") {
+		t.Errorf("unexpected error message: %v", err)
+	}
+}
+
+func TestNoInsecureOption_RejectsMixedCaseHTTP(t *testing.T) {
+	// Verify mixed case like "Http://" is also rejected.
+	c := NewClient("tok", "Http://127.0.0.1:1")
+	_, err := c.doGet(context.Background(), "Http://127.0.0.1:1/test")
+	if err == nil {
+		t.Fatal("expected error for mixed-case HTTP scheme")
+	}
+	if !strings.Contains(err.Error(), "refusing HTTP request") {
+		t.Errorf("unexpected error message: %v", err)
+	}
+}
+
+func TestAllowInsecureHTTP_WithoutEnvVar_Rejected(t *testing.T) {
+	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		t.Fatal("request should not have been sent")
+	}))
+	defer srv.Close()
+
+	t.Setenv("REVIEW_BOT_ALLOW_INSECURE", "")
+
+	c := NewClient("tok", srv.URL, AllowInsecureHTTP())
+	_, err := c.doGet(context.Background(), srv.URL+"/test")
+	if err == nil {
+		t.Fatal("expected error: AllowInsecureHTTP without env var should be rejected")
+	}
+	if !strings.Contains(err.Error(), "refusing HTTP request") {
+		t.Errorf("unexpected error message: %v", err)
+	}
+}
+
+func TestAllowInsecureHTTP_WithEnvVar_Permitted(t *testing.T) {
+	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		w.WriteHeader(http.StatusOK)
+		w.Write([]byte("insecure-ok"))
+	}))
+	defer srv.Close()
+
+	t.Setenv("REVIEW_BOT_ALLOW_INSECURE", "1")
+
+	c := NewClient("tok", srv.URL, AllowInsecureHTTP())
+	body, err := c.doGet(context.Background(), srv.URL+"/test")
+	if err != nil {
+		t.Fatalf("unexpected error: %v", err)
+	}
+	if string(body) != "insecure-ok" {
+		t.Errorf("body = %q, want %q", body, "insecure-ok")
+	}
+}
+
+func TestAllowInsecureHTTP_EnvVarNotOne_Rejected(t *testing.T) {
+	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		t.Fatal("request should not have been sent")
+	}))
+	defer srv.Close()
+
+	// "true" is not "1" — strict check
+	t.Setenv("REVIEW_BOT_ALLOW_INSECURE", "true")
+
+	c := NewClient("tok", srv.URL, AllowInsecureHTTP())
+	_, err := c.doGet(context.Background(), srv.URL+"/test")
+	if err == nil {
+		t.Fatal("expected error: env var 'true' is not '1'")
+	}
+	if !strings.Contains(err.Error(), "refusing HTTP request") {
+		t.Errorf("unexpected error message: %v", err)
+	}
+}
+
+func TestRedactURL_WithQuery(t *testing.T) {
+	got := redactURL("http://localhost:1234/path?secret=token&foo=bar")
+	want := "http://localhost:1234/path?<redacted>"
+	if got != want {
+		t.Errorf("redactURL = %q, want %q", got, want)
+	}
+}
+
+func TestRedactURL_NoQuery(t *testing.T) {
+	got := redactURL("http://localhost:1234/path")
+	want := "http://localhost:1234/path"
+	if got != want {
+		t.Errorf("redactURL = %q, want %q", got, want)
+	}
+}
+
+func TestRedactURL_Userinfo(t *testing.T) {
+	got := redactURL("http://user:pass@localhost:1234/path")
+	want := "http://localhost:1234/path"
+	if got != want {
+		t.Errorf("redactURL = %q, want %q", got, want)
+	}
+}
+
+func TestRedactURL_UserinfoWithQuery(t *testing.T) {
+	got := redactURL("http://user:pass@localhost:1234/path?secret=token")
+	want := "http://localhost:1234/path?<redacted>"
+	if got != want {
+		t.Errorf("redactURL = %q, want %q", got, want)
+	}
+}

github/export_test.go

@@ -0,0 +1,13 @@
+package github
+
+// AllowInsecureHTTPForTest permits sending credentials over plaintext HTTP
+// without requiring the REVIEW_BOT_ALLOW_INSECURE environment variable.
+// This is intended exclusively for test code using httptest.Server.
+//
+// Defined in a _test.go file so it is only available to test binaries.
+func AllowInsecureHTTPForTest() ClientOption {
+	return func(cfg *clientConfig) {
+		cfg.allowInsecureHTTP = true
+		cfg.insecureIsTestBypass = true
+	}
+}

integration_test.go

@@ -16,16 +16,17 @@ import (
 
 // Integration test requires a running Gitea instance and LLM endpoint.
 // Set environment variables:
-//   INTEGRATION_GITEA_URL     - Gitea base URL
-//   INTEGRATION_GITEA_TOKEN   - Gitea API token with repo access
-//   INTEGRATION_GITEA_REPO    - owner/repo with an open PR
-//   INTEGRATION_PR_NUMBER     - PR number to test against
-//   INTEGRATION_LLM_BASE_URL  - LLM API base URL
-//   INTEGRATION_LLM_API_KEY   - LLM API key
-//   INTEGRATION_LLM_MODEL     - Model name
+//
+//	INTEGRATION_VCS_URL       - VCS base URL
+//	INTEGRATION_GITEA_TOKEN   - Gitea API token with repo access
+//	INTEGRATION_GITEA_REPO    - owner/repo with an open PR
+//	INTEGRATION_PR_NUMBER     - PR number to test against
+//	INTEGRATION_LLM_BASE_URL  - LLM API base URL
+//	INTEGRATION_LLM_API_KEY   - LLM API key
+//	INTEGRATION_LLM_MODEL     - Model name
 
 func TestIntegration_FullReviewFlow(t *testing.T) {
-	giteaURL := os.Getenv("INTEGRATION_GITEA_URL")
+	giteaURL := os.Getenv("INTEGRATION_VCS_URL")
 	giteaToken := os.Getenv("INTEGRATION_GITEA_TOKEN")
 	giteaRepo := os.Getenv("INTEGRATION_GITEA_REPO")
 	prNumStr := os.Getenv("INTEGRATION_PR_NUMBER")