zervice.backblaze/index.html at master · Monadical-SAS/zervice.backblaze · GitHub

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<html>
    <head>
        <title>Zervice.BackBlaze | B2 DropBox</title>

        <style type="text/css">
            h1, h2 {
                font-family: 'Gill Sans', sans-serif;
                font-weight: 200;
            }
            input[type=file] {
                background-color: #dde6f7;
                padding: 20px;
                border-radius: 8px;
                box-shadow: 4px 4px 4px rgba(0,0,0,0.02);
                font-size: 14px;
            }
            .file-row {
                display: inline-block;
                width: 23%;
                border-radius: 8px;
                background: #f4f4fa;
                box-shadow: 4px 4px 4px rgba(0,0,0,0.02);
                margin: 1%;
                overflow: hidden;
                color: #333;
                text-decoration: none;
            }
            .file-row h2 {
                text-align: left;
                padding-left: 5px;
                font-family: monospace;
            }
            .file-row iframe {
                border: 0px;
                width: 100%;
                height: 200px;
            }
        </style>
    </head>
    <body>
        <br/>
        <center>
            <h1>Upload to B2</h1>
            <input type="file" id="drop" accept="image/png, image/jpeg" multiple/>
        </center>
        <h2>Files List</h2>
        <hr/>
        <div id="files"></div>

        <script src="https://unpkg.com/axios/dist/axios.min.js"></script>

        <script type="text/javascript">
            const fileList = document.getElementById('files')
            const onSelectFile = async (event) => {
                for (const file of event.target.files) {
                    // get a File blob object from the source <input type="file">
                    const [
                        uploadUrlAuth, headers,
                    ] = await Promise.all([
                        getUploadUrl(), getFileHeaders(file),
                    ])

                    const res = await uploadFileB2(
                        uploadUrlAuth,
                        file,
                        headers,
                        ({loaded, total}) => {
                            const pct = parseInt((loaded / total) * 100)
                            console.log('Uploading...', `${pct}%`)
                        },
                    )
                    const publicUrl = getPublicFileUrl(res.fileName)
                    const new_row = document.createElement('a')
                    new_row.href = publicUrl
                    new_row.classList.add('file-row')
                    new_row.innerHTML = `<iframe src="${publicUrl}"></iframe><h2 title="${res.fileId.slice(0,32)}">${file.name}</h2>`
                    fileList.appendChild(new_row)
                }
            }

            // const loadFiles = async (event) => {
            //     const res = await axios.get(
            //         'https://apiNNN.backblazeb2.com/b2api/v2/b2_list_file_names',
            //         {bucketId: BUCKET_ID},
            //     )
            // }

            const input = document.getElementById('drop')
            input.addEventListener('change', onSelectFile)

            // API Call Helpers

            const PUBLIC_BUCKET_URL = 'https://backblaze.zervice.io/file/zervice-backblaze'
            const SERVER_HOST = ''  // or e.g. 'http://localhost:8085'
            const SERVER_ROUTES = {
                b2_get_upload_url:      SERVER_HOST + '/b2/get_upload_url',
                b2_delete_file_version: SERVER_HOST + '/b2/delete_file_version',
            }

            // Ask the backend to fetch a new onetime upload URL from B2
            const getUploadUrl = async () =>                           // await -> {uploadUrl, authorizationToken, bucketId}
                (await axios.post(SERVER_ROUTES.b2_get_upload_url)).data

            // Ask the backend to delete a given fileId,fileName from B2
            const deleteFileVersion = async (fileId, fileName) =>        // await -> {bucketId, fileId, fileName}
                (await axios.post(SERVER_ROUTES.b2_delete_file_version)).data


            // Upload a file blob to B2 using a given upload_url and headers
            const uploadFileB2 = async (uploadUrlAuth, file, headers, onUploadProgress) =>     // await -> {fileId, action: 'upload', uploadTimestamp, ...}
                (await axios.post(
                    uploadUrlAuth.uploadUrl,
                    file, {
                    headers: {
                        'Authorization': uploadUrlAuth.authorizationToken,
                        ...headers,
                    },
                    onUploadProgress,
                })).data


            // Helpers


            // Read a File blob's contents as an ArrayBuffer
            const getFileContents = (file) =>                    // await -> ArrayBuffer
                new Promise((resolve, reject) => {
                    const reader = new FileReader()
                    reader.onload = (event) => resolve(event.target.result)
                    reader.readAsArrayBuffer(file)
                })

            // Get the SHA1 hash of an ArrayBuffer in hex digest str form
            const getFileHash = async (arrayBuffer) => {         // await -> '...sha1hexdigest...'
                const hashBuffer = await window.crypto.subtle.digest('SHA-1', arrayBuffer)
                const hashArray = Array.from(new Uint8Array(hashBuffer))
                const hashHex = hashArray.map(b => b.toString(16).padStart(2, '0')).join('')
                return hashHex
            }

            // Get the headers that will be used for b2_upload_file
            const getFileHeaders = async (file) => {           // await -> {...headers...}
                const content = await getFileContents(file)
                const sha1hash = await getFileHash(content)
                const ext = file.name.split('.').slice(-1)[0].toLowerCase()

                return {
                    'X-Bz-File-Name': encodeURIComponent(`${sha1hash}.${ext}`),
                    'X-Bz-Content-Sha1': sha1hash,
                    'Content-Type': file.type,
                    ...getCustomHeaders(file),
                }
            }

            // Header overrides go here
            const getCustomHeaders = async (file) => ({           // await -> {...headers...}
                // 'Content-Type': e.g. file.type, 'b2/x-auto', 'application/octet-stream'
                // 'X-Bz-File-Name': e.g. encodeURIComponent(file.name),
                // 'X-Bz-Content-Sha1': e.g. 'do_not_verify',
                // 'X-Bz-Info-b2-content-type': e.g. file.type, 'application/octet-stream', etc.
                // 'X-Bz-Info-b2-cache-control': e.g. encodeURIComponent('max-age=3600'),
                // 'X-Bz-Info-original-name': e.g. encodeURIComponent(file.name) -->
            })

            const getPublicFileUrl = (filename) => `${PUBLIC_BUCKET_URL}/${filename}`
        </script>
    </body>
</html>