Add the code and documentation

Author: donchev7

README.md

@@ -1,3 +1,23 @@
 # Azure-SAS-token
 
-Generate SAS token on the edge with cloudflare workers and this library
+Generate Azure SAS tokens on the edge with cloudflare workers and this library.
+
+Zero depdendencies.
+
+
+## How to use the library
+
+```ts
+import createBlobSas from './index'
+
+const expireInMin = 5
+
+const { blobSasUrl } = await createBlobSas({
+      accountKey: 'asd',
+      accountName: '1132',
+      blobName: '123.txt',
+      permissions: 'rw',
+      containerName: 'container',
+      expiresOn: new Date(new Date().valueOf() + expireInMin * 60 * 1000)
+})
+```

package.json

@@ -18,7 +18,6 @@
   "devDependencies": {
     "@cloudflare/workers-types": "^2.0.0",
     "prettier": "^2.1.2",
-    "ts-loader": "^8.0.4",
     "typescript": "^4.0.3"
   },
   "prettier": {

src/index.ts

@@ -1 +1,95 @@
-console.log('hello world')
+
+type SASinput = {
+  accountKey: string
+  accountName: string
+  containerName: string
+  blobName: string
+  permissions: string
+  expiresOn: Date
+  startsOn?: Date
+  identifier?: string
+  ipRange?: string
+  protocol?: string
+  cacheControl?: string
+  contentDisposition?: string
+  contentEncoding?: string
+  contentLanguage?: string
+  contentType?: string
+}
+
+const truncatedISO8061Date = (date: Date) => {
+  const dateString = date.toISOString()
+
+  return dateString.substring(0, dateString.length - 5) + 'Z'
+}
+
+const computeHMACSHA256 = async (stringToSign: string, accountKey: string) => {
+  const enc = new TextEncoder()
+  const signatureUTF8 = enc.encode(stringToSign)
+  const key = await crypto.subtle.importKey(
+    'raw',
+    Buffer.from(accountKey, 'base64'),
+    {
+      name: 'HMAC',
+      hash: {
+        name: 'SHA-256',
+      },
+    },
+    false,
+    ['sign']
+  )
+
+  const digest = await crypto.subtle.sign('HMAC', key, signatureUTF8)
+
+  return Buffer.from(digest).toString('base64')
+}
+
+const getCanonicalName = (accountName: string, containerName: string, blobName?: string) => {
+  const elements: string[] = [`/blob/${accountName}/${containerName}`]
+  if (blobName) {
+    elements.push(`/${blobName}`)
+  }
+  return elements.join('')
+}
+
+const getSASqueryParams = async (input: SASinput) => {
+  const resource = 'b'
+  const version = '2018-11-09'
+  const signedSnapshotTime = undefined
+
+  const stringToSign = [
+    input.permissions ? input.permissions : '',
+    input.startsOn ? truncatedISO8061Date(input.startsOn) : '',
+    truncatedISO8061Date(input.expiresOn),
+    getCanonicalName(input.accountName, input.containerName, input.blobName),
+    input.identifier ? input.identifier : '',
+    input.ipRange ? input.ipRange : '',
+    input.protocol ? input.protocol : '',
+    version,
+    resource,
+    signedSnapshotTime,
+    input.cacheControl ? input.cacheControl : '',
+    input.contentDisposition ? input.contentDisposition : '',
+    input.contentEncoding ? input.contentEncoding : '',
+    input.contentLanguage ? input.contentLanguage : '',
+    input.contentType ? input.contentType : '',
+  ].join('\n')
+
+  const signature = await computeHMACSHA256(stringToSign, input.accountKey)
+
+  return `sv=${version}&spr=https&se=${encodeURIComponent(
+    truncatedISO8061Date(input.expiresOn)
+  )}&sr=b&sp=rw&sig=${encodeURIComponent(signature)}`
+}
+
+export default async (input: SASinput) => {
+  const url = [input.containerName, input.blobName].filter(el => el).join('/')
+  const storageUri = new URL(url, `https://${input.accountName}.blob.core.windows.net`)
+  const queryParams = await getSASqueryParams(input)
+
+  storageUri.search = queryParams
+
+  return {
+    blobSasUrl: url.toString(),
+  }
+}

tsconfig.json

@@ -6,13 +6,13 @@
     "moduleResolution": "node",
     "esModuleInterop": true,
     "strict": true,
+    "sourceMap": true,
     "noUnusedLocals": true,
     "noUnusedParameters": true,
     "noImplicitReturns": true,
     "noFallthroughCasesInSwitch": true,
     "forceConsistentCasingInFileNames": true,
     "removeComments": true,
-    "types": [],
     "outDir": "./dist"
   }
 }

yarn.lock

@@ -7,232 +7,12 @@
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