spee.ch/controllers/serveController.js

const lbryApi = require('../helpers/lbryApi.js');
const db = require('../models');
const logger = require('winston');
const { resolveAgainstClaimTable, serveFile, showFile, showFileLite, getShortClaimIdFromLongClaimId, getClaimIdByLongChannelId, getAllChannelClaims, getLongChannelId, getShortChannelIdFromLongChannelId, getLongClaimId } = require('../helpers/serveHelpers.js');
const { postToStats, sendGoogleAnalytics } = require('../controllers/statsController.js');
const { SERVE, SHOW, SHOWLITE } = require('../helpers/constants.js');

function checkForLocalAssetByClaimId (claimId, name) {
  return new Promise((resolve, reject) => {
    db.File
      .findOne({where: { name, claimId }})
      .then(result => {
        if (result) {
          resolve(result.dataValues);
        } else {
          resolve(null);
        }
      })
      .catch(error => {
        reject(error);
      });
  });
}

function addGetResultsToFileRecord (fileInfo, getResult) {
  fileInfo.fileName = getResult.file_name;
  fileInfo.filePath = getResult.download_path;
  fileInfo.fileType = getResult.mime_type;
  return fileInfo;
}

function createFileRecord ({ name, claimId, outpoint, height, address, nsfw }) {
  return {
    name,
    claimId,
    outpoint,
    height,
    address,
    fileName: '',
    filePath: '',
    fileType: '',
    nsfw,
  };
}

function getAssetByLongClaimId (fullClaimId, name) {
  logger.debug('...getting asset by claim Id...');
  return new Promise((resolve, reject) => {
    // 1. check locally for claim
    checkForLocalAssetByClaimId(fullClaimId, name)
    .then(dataValues => {
      // if a result was found, return early with the result
      if (dataValues) {
        logger.debug('found a local file for this name and claimId');
        return resolve(dataValues);
      }
      logger.debug('no local file found for this name and claimId');
      // 2. if no local claim, resolve and get the claim
      resolveAgainstClaimTable(name, fullClaimId)
      .then(resolveResult => {
        logger.debug('resolve result >> ', resolveResult);
        // if no result, return early (claim doesn't exist or isn't free)
        if (!resolveResult) {
          return resolve(null);
        }
        let fileRecord = {};
        // get the claim
        lbryApi.getClaim(`${name}#${fullClaimId}`)
        .then(getResult => {
          logger.debug('getResult >>', getResult);
          fileRecord = createFileRecord(resolveResult);
          fileRecord = addGetResultsToFileRecord(fileRecord, getResult);
          // insert a record in the File table & Update Claim table
          return db.File.create(fileRecord);
        })
        .then(fileRecordResults => {
          logger.debug('File record successfully updated');
          resolve(fileRecord);
        })
        .catch(error => {
          reject(error);
        });
      })
      .catch(error => {
        reject(error);
      });
    })
    .catch(error => {
      reject(error);
    });
  });
}

module.exports = {
  getAssetByClaim (claimName, claimId) {
    logger.debug('getting asset by claim');
    return new Promise((resolve, reject) => {
      // 1. get the long claim id
      getLongClaimId(claimName, claimId)  // here
      // 2. get the claim Id
      .then(longClaimId => {
        logger.debug('long claim id = ', longClaimId);
        resolve(getAssetByLongClaimId(longClaimId, claimName));
      })
      .catch(error => {
        reject(error);
      });
    });
  },
  getAssetByChannel (channelName, channelId, claimName) {
    logger.debug('getting asset by channel');
    return new Promise((resolve, reject) => {
      // 1. get the long channel id
      getLongChannelId(channelName, channelId)
      // 2. get the claim Id
      .then(longChannelId => {
        return getClaimIdByLongChannelId(longChannelId, claimName);
      })
      // 3. get the asset by this claim id and name
      .then(claimId => {
        logger.debug('asset claim id = ', claimId);
        resolve(getAssetByLongClaimId(claimId, claimName));
      })
      .catch(error => {
        reject(error);
      });
    });
  },
  getChannelContents (channelName, channelId) {
    return new Promise((resolve, reject) => {
      let longChannelId;
      let shortChannelId;
      // 1. get the long channel Id
      getLongChannelId(channelName, channelId)
      // 2. get all claims for that channel
      .then(result => {
        longChannelId = result;
        return getShortChannelIdFromLongChannelId(channelName, longChannelId);
      })
      // 3. get all Claim records for this channel
      .then(result => {
        shortChannelId = result;
        return getAllChannelClaims(longChannelId);
      })
      // 4. add extra data not available from Claim table
      .then(allChannelClaims => {
        if (allChannelClaims) {
          allChannelClaims.forEach(element => {
            element['channelName'] = channelName;
            element['longChannelId'] = longChannelId;
            element['shortChannelId'] = shortChannelId;
            element['fileExtension'] = element.contentType.substring(element.contentType.lastIndexOf('/') + 1);
          });
        }
        return resolve(allChannelClaims);
      })
      .catch(error => {
        reject(error);
      });
    });
  },
  serveOrShowAsset (fileInfo, extension, method, headers, originalUrl, ip, res) {
    // add file extension to the file info
    if (extension === 'gifv') {
      fileInfo['fileExt'] = 'gifv';
    } else {
      fileInfo['fileExt'] = fileInfo.fileName.substring(fileInfo.fileName.lastIndexOf('.') + 1);
    }
    // add stats table
    postToStats(method, originalUrl, ip, fileInfo.name, fileInfo.claimId, 'success');
    // serve or show
    switch (method) {
      case SERVE:
        serveFile(fileInfo, res);
        sendGoogleAnalytics(method, headers, ip, originalUrl);
        return fileInfo;
      case SHOWLITE:
        showFileLite(fileInfo, res);
        return fileInfo;
      case SHOW:
        return getShortClaimIdFromLongClaimId(fileInfo.claimId, fileInfo.name)
        .then(shortId => {
          fileInfo['shortId'] = shortId;
          return resolveAgainstClaimTable(fileInfo.name, fileInfo.claimId);
        })
        .then(resolveResult => {
          fileInfo['title'] = resolveResult.title;
          fileInfo['description'] = resolveResult.description;
          showFile(fileInfo, res);
          return fileInfo;
        })
        .catch(error => {
          logger.error('throwing serve/show error...');
          throw error;
        });
      default:
        logger.error('I did not recognize that method');
        break;
    }
  },
};