feat(GET /ipfs/download/:cid): Download CID as readable stream

config/system-user-dev.json

@@ -1,6 +1,6 @@
 {
-  "password": "yKm2qMy2LkRNFJsCiD2B",
+  "password": "BJdugaoiq10ZJnA7Uskd",
   "email": "system@system.com",
-  "id": "67bb5a07da0eb4a2e7fc7bde",
+  "id": "67c114fd4935ba05e48f6bb2",
-  "token": "eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJpZCI6IjY3YmI1YTA3ZGEwZWI0YTJlN2ZjN2JkZSIsImlhdCI6MTc0MDMzMTUyN30.o-MDjJpoq2MNElzWQsrWjy-kL_wji2hxPrXLPomrw7I"
+  "token": "eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJpZCI6IjY3YzExNGZkNDkzNWJhMDVlNDhmNmJiMiIsImlhdCI6MTc0MDcwNzA2OX0.R5nU8J5yhGorp7I5kc8_dRESbo4hwCIrTtqJiVYVhLA"
 }

src/controllers/rest-api/ipfs/controller.js

@@ -40,6 +40,7 @@ class IpfsRESTControllerLib {
     this.getFileInfo = this.getFileInfo.bind(this)
     this.getPins = this.getPins.bind(this)
     this.cid2json = this.cid2json.bind(this)
+    this.downloadFile = this.downloadFile.bind(this)
   }
 
   /**
@@ -165,12 +166,34 @@ class IpfsRESTControllerLib {
       )
       ctx.body = readStream
     } catch (err) {
-      // wlogger.error('Error in ipfs/controller.js/viewFile(): ', err)
       console.log('Error in ipfs/controller.js/viewFile(): ', err)
       this.handleError(ctx, err)
     }
   }
 
+  /**
+   * @api {get} /ipfs/download/:cid Download a file via its IPFS CID
+   * @apiPermission public
+   * @apiName GetCidDownload
+   * @apiGroup REST IPFS
+   * @apiDescription Download a file via its IPFS CID. Returns a readable stream.
+   *
+   * @apiExample Example usage:
+   * curl -H "Content-Type: application/json" -X GET localhost:5001/ipfs/download/bafkreieaqtdhfywyddomswogynzymukosqqgqo7lkt5lch2zwfnc55m6om
+   */
+  async downloadFile (ctx) {
+    try {
+      const { cid } = ctx.params
+
+      const { readStream } = await this.useCases.ipfs.downloadCid({ cid })
+
+      ctx.body = readStream
+    } catch (err) {
+      console.log('Error in ipfs/controller.js/downloadFile(): ', err)
+      this.handleError(ctx, err)
+    }
+  }
+
   /**
    * @api {get} /ipfs/service Get the IPFS ID for the File Pin service
    * @apiPermission public
@@ -192,7 +215,7 @@ class IpfsRESTControllerLib {
         selectedIpfsFileProvider
       }
     } catch (err) {
-      // wlogger.error('Error in ipfs/controller.js/viewFile(): ', err)
+      // wlogger.error('Error in ipfs/controller.js/getService(): ', err)
       console.log('Error in ipfs/controller.js/getService(): ', err)
       this.handleError(ctx, err)
     }
@@ -220,7 +243,6 @@ class IpfsRESTControllerLib {
 
       ctx.body = metadata
     } catch (err) {
-      // wlogger.error('Error in ipfs/controller.js/viewFile(): ', err)
       console.log('Error in ipfs/controller.js/getFileInfo(): ', err)
       this.handleError(ctx, err)
     }
@@ -248,7 +270,6 @@ class IpfsRESTControllerLib {
 
       ctx.body = pinData
     } catch (err) {
-      // wlogger.error('Error in ipfs/controller.js/viewFile(): ', err)
       console.log('Error in ipfs/controller.js/getPins(): ', err)
       this.handleError(ctx, err)
     }
@@ -274,7 +295,6 @@ class IpfsRESTControllerLib {
 
       ctx.body = json
     } catch (err) {
-      // wlogger.error('Error in ipfs/controller.js/viewFile(): ', err)
       console.log('Error in ipfs/controller.js/cid2json(): ', err.message)
       this.handleError(ctx, err)
     }

src/controllers/rest-api/ipfs/index.js

@@ -57,6 +57,7 @@ class IpfsRouter {
     this.router.post('/connect', this.ipfsRESTController.connect)
     this.router.get('/node', this.ipfsRESTController.getThisNode)
     this.router.get('/view/:cid', this.ipfsRESTController.viewFile)
+    this.router.get('/download/:cid', this.ipfsRESTController.downloadFile)
     this.router.get('/service', this.ipfsRESTController.getService)
     this.router.get('/file-info/:cid', this.ipfsRESTController.getFileInfo)
     this.router.get('/pins', this.ipfsRESTController.getPins)

src/use-cases/ipfs-use-cases.js

@@ -9,6 +9,7 @@
 // import { exporter } from 'ipfs-unixfs-exporter'
 import { Duplex } from 'stream'
 import PSFFPP from 'psffpp'
+import { CID } from 'multiformats'
 
 // Local libraries
 // import PinEntity from '../entities/pin.js'
@@ -28,11 +29,13 @@ class IpfsUseCases {
 
     // Encapsulate dependencies
     this.psffpp = null // placeholder
+    this.CID = CID
 
     // Bind 'this' object to all class subfunctions.
     this.downloadCid = this.downloadCid.bind(this)
     // this.downloadCid2 = this.downloadCid2.bind(this)
     this.getWritePrice = this.getWritePrice.bind(this)
+    this.getCidMetadata = this.getCidMetadata.bind(this)
     this.cid2json = this.cid2json.bind(this)
 
     // State
@@ -43,7 +46,7 @@ class IpfsUseCases {
   // Returns a readable stream.
   async downloadCid (inObj = {}) {
     try {
-      const { cid } = inObj
+      let { cid } = inObj
 
       if (!cid) throw new Error('CID is undefined')
 
@@ -64,6 +67,47 @@ class IpfsUseCases {
 
       const helia = this.adapters.ipfs.ipfs
 
+      const cidClass = this.CID.parse(cid)
+
+      // Download the file from other nodes.
+      await helia.blockstore.get(cidClass)
+
+      // list cid content, to dermine if this is a file-based or directory-based CID.
+      const contentArray = []
+      for await (const file of helia.fs.ls(cid)) {
+        contentArray.push(file)
+      }
+
+      // Handle directory-based CIDs. This is used by Token Tiger for mutable and immutable token data.
+      /**
+      *  If the cid is a directory
+       * The next block of code sends a html page with a list of links with the file names into the directory.
+       * Skipping this code delivers directly the first file detected in the directory.
+       */
+      const isDir = contentArray[0].path.match('/') // TODO : looking for a better way to detect if is a directory
+      // 'listDir' is a flag to ignore this code on /download endpoint.
+      if (isDir) {
+        console.log('This CID is a directory. contentArray[0]: ', contentArray[0])
+        cid = `${cid}/${contentArray[0].name}`
+
+        // throw new Error('CID is a directory. Not supported yet.')
+        // const stream = new Stream.Readable({ read () { } })
+        // for (let i = 0; i < contentArray.length; i++) {
+        //   const cont = contentArray[i]
+        //   // List all paths excluding root path.
+        //   if (cont.path !== cid) {
+        //     // Add links to the gateway with the format  cid/:filename
+        //     stream.push(`<a href='${this.config.domainName}/ipfs/view/${cid}/${cont.name}' >/${cont.name} ( CID:  ${cont.cid} )</a><hr />`)
+        //   }
+        // }
+
+        // stream.push(null)
+        // // return fileName as html because the controller the library <mime.lookup> sends it as html
+        // return { readStream: stream }
+      } else {
+        console.log('This CID is not a directory.')
+      }
+
       // Convert the file to a Buffer.
       const fileChunks = []
       for await (const chunk of helia.fs.cat(cid)) {