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@zkp2p/reclaim-witness-sdk

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"use strict"; Object.defineProperty(exports, "__esModule", { value: true }); exports.makeHttpResponseParser = makeHttpResponseParser; exports.getHttpRequestDataFromTranscript = getHttpRequestDataFromTranscript; const tls_1 = require("@reclaimprotocol/tls"); const generics_1 = require("../utils/generics"); const redactions_1 = require("../utils/redactions"); const HTTP_HEADER_LINE_END = (0, tls_1.strToUint8Array)('\r\n'); /** * parses http/1.1 responses */ function makeHttpResponseParser() { /** the HTTP response data */ const res = { statusCode: 0, statusMessage: '', headers: {}, body: new Uint8Array(), complete: false, headersComplete: false, headerIndices: new Map(), headerEndIdx: 0 }; let remainingBodyBytes = 0; let isChunked = false; let remaining = new Uint8Array(); let currentByteIdx = 0; return { res, /** * Parse the next chunk of data * @param data the data to parse */ onChunk(data) { var _a, _b; // concatenate the remaining data from the last chunk remaining = (0, tls_1.concatenateUint8Arrays)([remaining, data]); // if we don't have the headers yet, keep reading lines // as each header is in a line if (!res.headersComplete) { for (let line = getLine(); typeof line !== 'undefined'; line = getLine()) { // first line is the HTTP version, status code & message if (!res.statusCode) { const [, statusCode, statusMessage] = line.match(/HTTP\/\d\.\d (\d+) (.*)/) || []; res.statusCode = Number(statusCode); res.statusMessage = statusMessage; res.statusLineEndIndex = currentByteIdx - HTTP_HEADER_LINE_END.length; } else if (line === '') { // empty line signifies end of headers res.headersComplete = true; res.headerEndIdx = currentByteIdx - 4; // if the response is chunked, we need to process the body differently if ((_a = res.headers['transfer-encoding']) === null || _a === void 0 ? void 0 : _a.includes('chunked')) { isChunked = true; res.chunks = []; break; // if the response has a content-length, we know how many bytes to read } else if (res.headers['content-length']) { remainingBodyBytes = Number(res.headers['content-length']); break; } else { remainingBodyBytes = -1; break; // otherwise, // no content-length, no chunked transfer encoding // means wait till the stream ends // https://stackoverflow.com/a/11376887 } } else if (!res.complete) { // parse the header const [key, value] = line.split(': '); res.headers[key.toLowerCase()] = value; res.headerIndices[key.toLowerCase()] = { fromIndex: currentByteIdx - line.length - HTTP_HEADER_LINE_END.length, toIndex: currentByteIdx - HTTP_HEADER_LINE_END.length }; } else { throw new Error('got more data after response was complete'); } } } if (res.headersComplete) { if (remainingBodyBytes) { readBody(); // if no more body bytes to read, // and the response was not chunked we're done if (!remainingBodyBytes && !isChunked) { res.complete = true; } } if (res.headers['content-length'] === '0') { res.complete = true; } if (isChunked) { for (let line = getLine(); typeof line !== 'undefined'; line = getLine()) { if (line === '') { continue; } const chunkSize = Number.parseInt(line, 16); // if chunk size is 0, we're done if (!chunkSize) { res.complete = true; continue; } (_b = res.chunks) === null || _b === void 0 ? void 0 : _b.push({ fromIndex: currentByteIdx, toIndex: currentByteIdx + chunkSize, }); // otherwise read the chunk remainingBodyBytes = chunkSize; readBody(); // if we read all the data we had, // but there's still data left, // break the loop and wait for the next chunk if (remainingBodyBytes) { break; } } } } }, /** * Call to prevent further parsing; indicating the end of the request * Checks that the response is valid & complete, otherwise throws an error */ streamEnded() { if (!res.headersComplete) { throw new Error('stream ended before headers were complete'); } if (remaining.length) { throw new Error('stream ended with remaining data'); } if (remainingBodyBytes > 0) { throw new Error('stream ended before all body bytes were received'); } res.complete = true; } }; function readBody() { if (res.complete) { throw new Error('got more data after response was complete'); } if (!res.bodyStartIndex) { res.bodyStartIndex = currentByteIdx; } let bytesToCopy; if (remainingBodyBytes === -1) { // all bytes are body bytes bytesToCopy = remaining.length; } else { // take the number of bytes we need to read, or the number of bytes remaining // and append to the bytes of the body bytesToCopy = Math.min(remainingBodyBytes, remaining.length); remainingBodyBytes -= bytesToCopy; } res.body = (0, tls_1.concatenateUint8Arrays)([ res.body, remaining.slice(0, bytesToCopy) ]); remaining = remaining.slice(bytesToCopy); currentByteIdx += bytesToCopy; } function getLine() { // find end of line, if it exists // otherwise return undefined const idx = (0, generics_1.findIndexInUint8Array)(remaining, HTTP_HEADER_LINE_END); if (idx === -1) { return undefined; } const line = (0, generics_1.uint8ArrayToStr)(remaining.slice(0, idx)); remaining = remaining.slice(idx + HTTP_HEADER_LINE_END.length); currentByteIdx += idx + HTTP_HEADER_LINE_END.length; return line; } } /** * Read the HTTP request from a TLS receipt transcript. * @param receipt the transcript to read from or application messages if they were extracted beforehand * @returns the parsed HTTP request */ function getHttpRequestDataFromTranscript(receipt) { const clientMsgs = receipt .filter(s => s.sender === 'client'); // if the first message is redacted, we can't parse it // as we don't know what the request was if (clientMsgs[0].message[0] === redactions_1.REDACTION_CHAR_CODE) { throw new Error('First client message request is redacted. Cannot parse'); } const request = { method: '', url: '', protocol: '', headers: {} }; let requestBuffer = (0, tls_1.concatenateUint8Arrays)(clientMsgs.map(m => m.message)); // keep reading lines until we get to the end of the headers for (let line = getLine(); typeof line !== 'undefined'; line = getLine()) { if (line === '') { break; } if (!request.method) { const [, method, url, protocol] = line.match(/(\w+) (.*) (.*)/) || []; request.method = method.toLowerCase(); request.url = url; request.protocol = protocol; } else { let keyIdx = line.indexOf(':'); if (keyIdx === -1) { keyIdx = line.length - 1; } const key = line.slice(0, keyIdx) .toLowerCase() .trim(); const value = line.slice(keyIdx + 1) .trim(); const oldValue = request.headers[key]; if (typeof oldValue === 'string') { request.headers[key] = [oldValue, value]; } else if (Array.isArray(oldValue)) { oldValue.push(value); } else { request.headers[key] = value; } } } //the rest is request body if (requestBuffer.length) { request.body = requestBuffer; } if (!request.method) { throw new Error('Client request is incomplete'); } return request; function getLine() { const idx = (0, generics_1.findIndexInUint8Array)(requestBuffer, HTTP_HEADER_LINE_END); if (idx === -1) { return undefined; } const line = (0, generics_1.uint8ArrayToStr)(requestBuffer.slice(0, idx)); requestBuffer = requestBuffer .slice(idx + HTTP_HEADER_LINE_END.length); return line; } } //# 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