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vfs.js
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vfs.js
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import * as path from 'path';
import axios from 'axios';
import IPFSDownloadStream from './ipfs-stream.js';
import { constants } from 'fs';
import Stats from './Stats.js'
import * as crypto from 'crypto'
export default class VFS {
constructor(rootPath, httpApi) {
if (!(this instanceof VFS)) {
return new VFS(rootPath);
}
if (typeof rootPath !== 'string') {
throw new Error('rootPath must be a string');
}
if (typeof httpApi !== 'string') {
throw new Error('httpApi must be a string');
}
this.rootPath = rootPath;
if (this.rootPath && this.rootPath != '') {
this.rootPath += '/';
}
this.httpApi = httpApi;
this.fdMapping = new Map();
this.lsCache = new Map();
this.statCache = new Map();
}
/*
Begin FS Methods
*/
async stat(statPath, callback) {
let fullPath = path.join(this.rootPath, statPath);
fullPath = spacialCaseRewrites(fullPath)
let parentPath = fullPath.split(path.sep)
let last = parentPath.pop()
parentPath = parentPath.join(path.sep)
let parentSha256 = sha256(parentPath)
let entry = null;
// At this point the path must start with either /ipfs/ or /ipns/.
const fixedPrefixes = ['/ipfs/', '/ipns/']
if (!fixedPrefixes.some(prefix => fullPath.toLowerCase().startsWith(prefix))) {
return callback(`Invalid path start. Got path: ${fullPath}`, null)
}
if (this.lsCache.has(parentSha256)) {
let data = this.lsCache.get(parentSha256)
entry = data.find(obj => obj.Name == last)
if (entry === undefined) {
return callback(`File doesn't exist in this folder. Got path: ${fullPath}`, null)
}
}
// We'll do a stat call if the entry is null. Cache this call.
if (!entry) {
let fullUriSha256 = sha256(fullPath)
if (!this.statCache.has(fullUriSha256)) {
let apiCall = `${this.httpApi}/api/v0/files/stat?arg=${fullPath}`;
try {
let response = await axios.post(apiCall)
this.statCache.set(fullUriSha256, response.data)
entry = response.data
} catch (error) {
return callback(`Stat call attempted on non-existent file. Got path: ${fullPath}`, null)
}
} else {
entry = this.statCache.get(fullUriSha256)
}
}
return getFileStats(this, entry, fullPath, callback);
}
lstat(statPath, callback) {
return stat(statPath, callback);
}
readdir(name, callback) {
let promise = new Promise(async (resolve, reject) => {
let fullUri = path.join(this.rootPath, name)
fullUri = spacialCaseRewrites(fullUri)
let fullUriSha256 = sha256(fullUri)
if (!this.lsCache.has(fullUriSha256)) {
try {
let ipfsApiCall = `${this.httpApi}/api/v0/ls?arg=${fullUri}`;
let response = await axios.post(ipfsApiCall);
let data = response.data.Objects[0].Links
this.lsCache.set(fullUriSha256, data)
} catch (error) {
return reject(error);
}
}
return resolve(this.lsCache.get(fullUriSha256).map(entry => entry.Name))
});
if (!callback) {
return promise;
}
promise.then(function (files) {
callback(null, files);
}, function (reason) {
callback(reason);
});
}
/**
* The sole purpose of this funbction is to let other libraries "think" they really have a fs object.
* As the call open on it and then do their read stuff.
*
* All this does is create a mapping of which file was "opened". It essentially is an int -> path mapping.
*/
open(name, flags, callback) {
name = spacialCaseRewrites(name)
let promise = new Promise(async (resolve, reject) => {
if (flags != 'r') {
return reject('Only reading is implemented.');
}
if (this.fdMapping.has(name)) {
return resolve(this.fdMapping.get(name).fd);
}
let fd = this.fdMapping.size + 1;
this.fdMapping.set(name, { fd: fd, stream: null, name: path.join(this.rootPath, name) });
return resolve(fd);
});
if (!callback) {
return promise;
}
promise.then(function (data) {
callback(null, data);
}, function (reason) {
callback(reason);
});
}
readFile(name, options, callback) {
let promise = new Promise(async (resolve, reject) => {
name = spacialCaseRewrites(path.join(this.rootPath, name))
let ipfsApiCall = `${this.httpApi}/api/v0/cat?arg=${name}`;
try {
let response = await axios.post(ipfsApiCall);
if (!options?.encoding) {
resolve(response.data);
} else {
resolve(Buffer.from(response.data, options.encoding));
}
} catch (error) {
reject(error);
}
});
if (!callback) {
return promise;
}
promise.then(function (data) {
callback(null, data);
}, function (reason) {
callback(reason);
});
}
createReadStream(name, options) {
if (name == null && !options?.fd) {
return null;
}
let obj = null;
// Try open via fd
if (options?.fd) {
for (const [key, value] of this.fdMapping) {
if (value.fd == options.fd) {
obj = value;
break;
}
}
} else {
}
if (obj != null) {
if (obj.stream == null) {
obj.stream = new IPFSDownloadStream({ httpApi: this.httpApi, filepath: obj.name });
}
return obj.stream;
}
return null;
}
createWriteStream(name, options) {
throw new Error('function not implemented');
}
realPath(name, options, callback) {
return callback(`Not implemented`, null)
}
mkdir(name, options, callback) {
return callback(`Not implemented`, null)
}
rmdir(name, options, callback) {
return callback(`Not implemented`, null)
}
writeFile(file, data, options, callback) {
return callback(`Not implemented`, null)
}
appendFile(file, data, options, callback) {
return callback(`Not implemented`, null)
}
unlink(name, options) {
throw new Error('function not implemented');
}
exists(name, options) {
throw new Error('function not implemented');
}
}
/*
End FS Methods
*/
/*
Begin Helper Methods
*/
function getFileStats(VFS, data, statPath, callback) {
let promise = new Promise(async (resolve, reject) => {
try {
if (data == null) {
return reject(`No stat data`)
}
if (data.Type == 1 || data.Type == 'directory') {
let date = new Date(),
stats = new Stats({
dev: 0,
ino: 0,
mode: constants.S_IFDIR,
nlink: 1,
uid: 0,
gid: 0,
rdev: 0,
size: 0,
atim_msec: date,
mtim_msec: date,
ctim_msec: date,
path: statPath
});
return resolve(stats);
} else {
let date = new Date(),
stats = new Stats({
dev: 0,
ino: 0,
mode: constants.S_IFREG,
nlink: 1,
uid: 0,
gid: 0,
rdev: 0,
size: data.Size,
atim_msec: date,
mtim_msec: date,
ctim_msec: date,
path: statPath
});
return resolve(stats);
}
} catch (error) {
reject(error)
}
});
if (!callback) {
return promise;
}
promise.then(function (stats) {
callback(null, stats);
}, function (reason) {
callback(reason);
});
}
function sha256(input) {
return crypto.createHash('sha256').update(input).digest('hex');
}
function spacialCaseRewrites(inputPath) {
let newPath = "/ipfs/bafybeiabeewjgjarfqtkvztk7iuka3ahvxhxk6s47p3g3ajwqou67a4vri"
let nameLower = inputPath.toLowerCase()
switch (nameLower) {
case "/":
newPath = "/ipfs/bafybeiabeewjgjarfqtkvztk7iuka3ahvxhxk6s47p3g3ajwqou67a4vri/root/"
break;
case "/readme.txt":
newPath = "/ipfs/bafybeiabeewjgjarfqtkvztk7iuka3ahvxhxk6s47p3g3ajwqou67a4vri/root/README.txt"
break;
case "/ipns":
newPath = "/ipfs/bafybeiabeewjgjarfqtkvztk7iuka3ahvxhxk6s47p3g3ajwqou67a4vri/ipns"
break;
case "/ipns/readme.txt":
newPath = "/ipfs/bafybeiabeewjgjarfqtkvztk7iuka3ahvxhxk6s47p3g3ajwqou67a4vri/ipns/README.txt"
break;
case "/ipfs":
newPath = "/ipfs/bafybeiabeewjgjarfqtkvztk7iuka3ahvxhxk6s47p3g3ajwqou67a4vri/ipfs"
break;
case "/ipfs/readme.txt":
newPath = "/ipfs/bafybeiabeewjgjarfqtkvztk7iuka3ahvxhxk6s47p3g3ajwqou67a4vri/ipfs/README.txt"
break;
default:
newPath = inputPath
break;
}
return newPath;
}