betajs/mock-file-server

module.exports = function (fileSystem, options) {
    
    var result = function (status, data) {
        return {
            status: status,
            data: data || {}
        };
    };
    
    return {

        getFileSize: function (filename) {
            if (fileSystem.exists(filename)) {
                var size = fileSystem.size(filename);
                console.log("Request size of", filename, "is", size);
                return result(200, {size: size});
            } else {
                console.log("Request size of", filename, "not found");
                return result(404);
            }
        },
        
        readFile: function (filename) {
            if (fileSystem.exists(filename)) {
                console.log("Streaming", filename);
                return result(200, fileSystem.read(filename));
            } else {
                console.log("Streaming", filename, "not found");
                return result(404);
            }
        },
        
        writeFile: function (filename, buffer) {
            console.log("Storing", filename);
            fileSystem.write(filename, buffer);
            return result(200);
        },
        
        writeFileChunk: function (filename, buffer, chunkNumber) {
            console.log("Storing", filename, "chunk", chunkNumber);
            fileSystem.write(filename + "." + chunkNumber + ".chunk", buffer);
            return result(200);
        },
        
        assembleFileChunks: function (filename, requestTotalSize) {
            console.log("Assembling", filename, "total size", requestTotalSize);
            var chunkNumber = 1;
            var totalSize = 0;
            while (true) {
                var chunkName = filename + "." + chunkNumber + ".chunk";
                if (fileSystem.exists(chunkName)) {
                    var size = fileSystem.size(chunkName);
                    console.log("Testing", chunkName, "with size", size);
                    chunkNumber++;
                    totalSize += size;
                } else {
                    console.log("Testing", chunkName, "not found");
                    break;
                }
            }
            if (requestTotalSize != totalSize) {
                console.log("Request total size", requestTotalSize, "not equal to calculated total size", totalSize);
                return result(412);
            }
            console.log("Request total size", requestTotalSize, "equal to calculated total size", totalSize);
            var buffer = null;
            chunkNumber = 1;
            while (true) {
                var chunkNameX = filename + "." + chunkNumber + ".chunk";
                if (!fileSystem.exists(chunkNameX))
                    break;
                buffer = buffer ? Buffer.concat([buffer, fileSystem.read(chunkNameX)]) : fileSystem.read(chunkNameX);
                fileSystem.remove(chunkNameX);
                chunkNumber++;
            }
            fileSystem.write(filename, buffer);
            return result(200);
        }

    };
};