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interface TreeItem {
contentType: "directory" | "file";
name: string;
path: string;
}
interface RawPayload {
repo: {
ownerLogin: string;
name: string;
};
refInfo: { name: string };
path: string;
tree?: {
items: TreeItem[];
};
blob?: {
language?: string;
rawLines?: string[];
highlightedLines?: {
text?: string;
}[];
size: number;
};
}
interface GitHubCommon {
repo: {
owner: string;
name: string;
};
branch: string;
path: string;
}
export interface GitHubTree extends GitHubCommon {
items: TreeItem[];
}
export interface GitHubBlob extends GitHubCommon {
language: string | null;
size: number;
content: string;
rawContent: string;
}
async function fetchGitHubPage(path: string): Promise<string> {
// GitHub throttles/blocks requests without realistic browser headers.
// These headers make the request appear as a standard browser visit.
const headers = {
"User-Agent":
"Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/131.0.0.0 Safari/537.36",
Accept:
"text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8",
"Accept-Language": "en-US,en;q=0.5",
};
const response = await fetch(`https://github.com/${path}`, { headers });
return response.text();
}
function parsePayload(
html: string,
dataTarget: string,
prop: string[],
): RawPayload | null {
const regex = new RegExp(
`<script type="application/json" data-target="${dataTarget}">([^<]+)</script>`,
"g",
);
match: for (const match of html.matchAll(regex)) {
let data;
try {
data = JSON.parse(match[1]);
} catch {
continue;
}
for (const key of prop) {
data = data[key];
if (data === undefined) continue match;
}
return data;
}
return null;
}
function extractGitHub<T>(payload: RawPayload, extra: T): GitHubCommon & T {
return {
repo: {
owner: payload.repo.ownerLogin,
name: payload.repo.name,
},
branch: payload.refInfo.name,
path: payload.path,
...extra,
};
}
export async function getGitHubTree(
owner: string,
repo: string,
branch: string,
path: string,
): Promise<GitHubTree> {
const html = await fetchGitHubPage(`${owner}/${repo}/tree/${branch}/${path}`);
// GitHub uses different formats for root vs subdirectories.
const payload =
// Root directory format.
parsePayload(html, "react-partial.embeddedData", [
"props",
"initialPayload",
]) ||
// Subdirectory format.
parsePayload(html, "react-app.embeddedData", ["payload"]);
if (payload?.tree === undefined) {
throw new Error("Could not find tree data in embedded JSON");
}
return extractGitHub(payload, { items: payload.tree.items });
}
export async function getGitHubBlob(
owner: string,
repo: string,
branch: string,
path: string,
): Promise<GitHubBlob> {
const html = await fetchGitHubPage(`${owner}/${repo}/blob/${branch}/${path}`);
const payload = parsePayload(html, "react-app.embeddedData", ["payload"]);
if (payload?.blob === undefined) {
throw new Error("Could not find blob data in embedded JSON");
}
const blob = payload.blob;
const rawLines = blob.rawLines || [];
const rawContent = rawLines.join("\n");
const highlightedLines = blob.highlightedLines || [];
const content = highlightedLines.map((line) => line.text || "").join("\n");
return extractGitHub(payload, {
content: content || rawContent,
rawContent,
language: blob.language || null,
size: blob.size,
});
}
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