1 files changed, 132 insertions, 0 deletions
diff --git a/cgithub/src/app.ts b/cgithub/src/app.ts
new file mode 100644
index 0000000..78b59ae
--- /dev/null
+++ b/cgithub/src/app.ts
@@ -0,0 +1,132 @@
+import type { Eta } from "eta";
+import { type Context, Hono } from "hono";
+import type { StatusCode } from "hono/utils/http-status";
+import {
+  getGitHubBlob,
+  getGitHubCommits,
+  getGitHubIssues,
+  getGitHubOwner,
+  getGitHubPulls,
+  getGitHubRelease,
+  getGitHubReleases,
+  getGitHubRepo,
+  getGitHubTree,
+  GitHubHTTPError,
+  RedirectError,
+} from "./scraper.ts";
+
+export function createApp(eta: Eta) {
+  const app = new Hono();
+
+  app.get("/", async (c) => {
+    return c.html(eta.render("home.eta", {}));
+  });
+
+  async function tryRender<T extends object>(c: Context, template: string, promise: Promise<T>) {
+    let data: T;
+    try {
+      data = await promise;
+    } catch (e) {
+      if (e instanceof RedirectError) {
+        if (e.location.startsWith("https://")) {
+          c.header("Referrer-Policy", "no-referrer");
+        }
+        return c.redirect(e.location);
+      } else if (e instanceof GitHubHTTPError) {
+        c.status(e.status as StatusCode);
+        const message = `GitHub responded with HTTP ${e.status} ${e.message}`;
+        return c.html(eta.render("error.eta", { title: e.message, message }));
+      } else {
+        c.status(500);
+        return c.html(eta.render("error.eta", { message: "" + e }));
+      }
+    }
+    return c.html(eta.render(template, data));
+  }
+
+  app.get("/:owner", async (c) => {
+    const { owner } = c.req.param();
+    return tryRender(c, "owner.eta", getGitHubOwner(owner));
+  });
+
+  app.get("/:owner/:repo", async (c) => {
+    const { owner, repo } = c.req.param();
+    return tryRender(c, "repo.eta", getGitHubRepo(owner, repo));
+  });
+
+  app.get("/:owner/:repo/tree/:branch/:path{.*}?", async (c) => {
+    const { owner, repo, branch, path = "" } = c.req.param();
+    return tryRender(c, "tree.eta", getGitHubTree(owner, repo, branch, path));
+  });
+
+  app.get("/:owner/:repo/blob/:branch/:path{.*}", async (c) => {
+    const { owner, repo, branch, path } = c.req.param();
+    return tryRender(c, "blob.eta", getGitHubBlob(owner, repo, branch, path));
+  });
+
+  app.get("/:owner/:repo/raw/:branch/:path{.*}", async (c) => {
+    const { owner, repo, branch, path } = c.req.param();
+    c.header("Referrer-Policy", "no-referrer");
+    return c.redirect(`https://raw.githubusercontent.com/${owner}/${repo}/${branch}/${path}`);
+  });
+
+  app.get("/:owner/:repo/issues", async (c) => {
+    const { owner, repo } = c.req.param();
+    const q = c.req.query("q");
+
+    // GitHub supports combined issue/PR search, apparently for legacy. We just
+    // redirect to issue-only search.
+    if (q && !/\bis:issue\b/.test(q)) {
+      return c.redirect(`/${owner}/${repo}/issues?q=${encodeURIComponent(`is:issue ${q}`)}`);
+    }
+
+    return tryRender(c, "issues.eta", getGitHubIssues(owner, repo, { q }));
+  });
+
+  app.get("/:owner/:repo/pulls", async (c) => {
+    const { owner, repo } = c.req.param();
+    const q = c.req.query("q");
+    return tryRender(c, "pulls.eta", getGitHubPulls(owner, repo, { q }));
+  });
+
+  app.get("/:owner/:repo/search", async (c) => {
+    const { owner, repo } = c.req.param();
+    const q = c.req.query("q") ?? "";
+    const type = c.req.query("type") ?? "issues";
+
+    if (type === "issues") {
+      return c.redirect(`/${owner}/${repo}/issues?q=${encodeURIComponent(q)}`);
+    } else if (type === "pullrequests") {
+      return c.redirect(`/${owner}/${repo}/pulls?q=${encodeURIComponent(q)}`);
+    }
+
+    // Redirect unhandled search types (like code, which requires sign in anyway).
+    c.header("Referrer-Policy", "no-referrer");
+    return c.redirect(
+      `https://github.com/${owner}/${repo}/search?${new URLSearchParams(c.req.query()).toString()}`,
+    );
+  });
+
+  app.get("/:owner/:repo/commits/:branch/:path{.*}?", async (c) => {
+    const { owner, repo, branch, path = "" } = c.req.param();
+    return tryRender(c, "commits.eta", getGitHubCommits(owner, repo, branch, path));
+  });
+
+  app.get("/:owner/:repo/releases/tag/:tag", async (c) => {
+    const { owner, repo, tag } = c.req.param();
+    return tryRender(c, "release.eta", getGitHubRelease(owner, repo, tag));
+  });
+
+  app.get("/:owner/:repo/releases", async (c) => {
+    const { owner, repo } = c.req.param();
+    return tryRender(c, "releases.eta", getGitHubReleases(owner, repo));
+  });
+
+  app.all("*", async (c) => {
+    const path = c.req.path;
+    c.header("Referrer-Policy", "no-referrer");
+    return c.redirect(`https://github.com${path}`);
+  });
+
+  return app;
+}