110 lines
3.9 KiB
JavaScript
110 lines
3.9 KiB
JavaScript
const logger = require('winston');
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const { getClaimId, getLocalFileRecord } = require('../controllers/serveController.js');
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const { handleErrorResponse } = require('./errorHandlers.js');
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const SERVE = 'SERVE';
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const SHOW = 'SHOW';
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const NO_FILE = 'NO_FILE';
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const NO_CHANNEL = 'NO_CHANNEL';
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const NO_CLAIM = 'NO_CLAIM';
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function clientAcceptsHtml ({accept}) {
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return accept && accept.match(/text\/html/);
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};
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function requestIsFromBrowser (headers) {
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return headers['user-agent'] && headers['user-agent'].match(/Mozilla/);
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};
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function clientWantsAsset ({accept, range}) {
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const imageIsWanted = accept && accept.match(/image\/.*/) && !accept.match(/text\/html/) && !accept.match(/text\/\*/);
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const videoIsWanted = accept && range;
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return imageIsWanted || videoIsWanted;
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};
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function isValidClaimId (claimId) {
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return ((claimId.length === 40) && !/[^A-Za-z0-9]/g.test(claimId));
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};
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function isValidShortId (claimId) {
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return claimId.length === 1; // it should really evaluate the short url itself
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};
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function isValidShortIdOrClaimId (input) {
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return (isValidClaimId(input) || isValidShortId(input));
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};
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function serveAssetToClient (claimId, name, res) {
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return getLocalFileRecord(claimId, name)
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.then(fileRecord => {
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// check that a local record was found
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if (fileRecord === NO_FILE) {
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return res.status(307).redirect(`/api/claim/get/${name}/${claimId}`);
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}
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// serve the file
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const {filePath, fileType} = fileRecord;
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logger.verbose(`serving file: ${filePath}`);
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const sendFileOptions = {
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headers: {
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'X-Content-Type-Options': 'nosniff',
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'Content-Type' : fileType || 'image/jpeg',
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},
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};
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res.status(200).sendFile(filePath, sendFileOptions);
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})
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.catch(error => {
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throw error;
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});
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};
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module.exports = {
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getClaimIdAndServeAsset (channelName, channelClaimId, claimName, claimId, originalUrl, ip, res) {
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// get the claim Id and then serve the asset
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getClaimId(channelName, channelClaimId, claimName, claimId)
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.then(fullClaimId => {
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if (fullClaimId === NO_CLAIM) {
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return res.status(404).json({success: false, message: 'no claim id could be found'});
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} else if (fullClaimId === NO_CHANNEL) {
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return res.status(404).json({success: false, message: 'no channel id could be found'});
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}
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serveAssetToClient(fullClaimId, claimName, res);
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// postToStats(responseType, originalUrl, ip, claimName, fullClaimId, 'success');
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})
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.catch(error => {
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handleErrorResponse(originalUrl, ip, error, res);
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// postToStats(responseType, originalUrl, ip, claimName, fullClaimId, 'fail');
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});
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},
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determineResponseType (hasFileExtension, headers) {
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let responseType;
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if (hasFileExtension) {
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responseType = SERVE; // assume a serve request if file extension is present
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if (clientAcceptsHtml(headers)) { // if the request comes from a browser, change it to a show request
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responseType = SHOW;
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}
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} else {
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responseType = SHOW;
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if (clientWantsAsset(headers) && requestIsFromBrowser(headers)) { // this is in case someone embeds a show url
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logger.debug('Show request came from browser but wants an image/video. Changing response to serve...');
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responseType = SERVE;
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}
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}
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return responseType;
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},
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flipClaimNameAndIdForBackwardsCompatibility (identifier, name) {
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// this is a patch for backwards compatability with '/name/claim_id' url format
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if (isValidShortIdOrClaimId(name) && !isValidShortIdOrClaimId(identifier)) {
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const tempName = name;
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name = identifier;
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identifier = tempName;
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}
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return [identifier, name];
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},
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logRequestData (responseType, claimName, channelName, claimId) {
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logger.debug('responseType ===', responseType);
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logger.debug('claim name === ', claimName);
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logger.debug('channel name ===', channelName);
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logger.debug('claim id ===', claimId);
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},
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};
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