feat(blob): Ensure contentType always has a value in blob results (#803)

* feat(blob): Ensure contentType always has a value in blob results

Before this commit, when using extension less pathnames or unknown extensions
(like wxss) then:
- Errors would be imprecise ("contentType  is not allowed", empty string issue)
- When creating blobs, contentType would be undefined

Once you upgrade:
- We will default to 'application/octet-stream' when we can't find a correct
  mime type from extension or no extension in pathname
- Errors will be precise ("contentType 'application/octet-stream' is not
  allowed)
- contentType is always present on put/upload/copy

This is a BREAKING CHANGE if you were used to do something like:
```js
if (contentType === undefined) {
  // do something
}
```

* changeset

* fix tests

.changeset/rich-ligers-run.md

@@ -0,0 +1,5 @@
+---
+'@vercel/blob': minor
+---
+
+contentType default is now 'application/octet-stream' instead of `undefined`

packages/blob/src/api.node.test.ts

@@ -66,7 +66,7 @@ describe('api', () => {
             authorization: 'Bearer 123',
             'x-api-blob-request-attempt': '0',
             'x-api-blob-request-id': expect.any(String) as string,
-            'x-api-version': '7',
+            'x-api-version': '8',
           },
           method: 'POST',
         },

packages/blob/src/api.ts

@@ -126,7 +126,7 @@ export interface BlobApiError {
 // This version is used to ensure that the client and server are compatible
 // The server (Vercel Blob API) uses this information to change its behavior like the
 // response format
-const BLOB_API_VERSION = 7;
+const BLOB_API_VERSION = 8;
 
 function getApiVersion(): string {
   let versionOverride = null;

packages/blob/src/client.browser.test.ts

@@ -92,7 +92,7 @@ describe('client', () => {
             authorization: 'Bearer vercel_blob_client_fake_123',
             'x-api-blob-request-attempt': '0',
             'x-api-blob-request-id': `fake:${Date.now()}:${requestId}`,
-            'x-api-version': '7',
+            'x-api-version': '8',
           },
           method: 'PUT',
         },
@@ -207,7 +207,7 @@ describe('client', () => {
             authorization: 'Bearer vercel_blob_client_fake_token_for_test',
             'x-api-blob-request-attempt': '0',
             'x-api-blob-request-id': `fake:${Date.now()}:${requestId}`,
-            'x-api-version': '7',
+            'x-api-version': '8',
             'x-mpu-action': 'create',
           },
           method: 'POST',
@@ -224,7 +224,7 @@ describe('client', () => {
             authorization: 'Bearer vercel_blob_client_fake_token_for_test',
             'x-api-blob-request-attempt': '0',
             'x-api-blob-request-id': `fake:${Date.now()}:${requestId}`,
-            'x-api-version': '7',
+            'x-api-version': '8',
             'x-mpu-action': 'upload',
             'x-mpu-key': 'key',
             'x-mpu-upload-id': 'uploadId',
@@ -243,7 +243,7 @@ describe('client', () => {
             authorization: 'Bearer vercel_blob_client_fake_token_for_test',
             'x-api-blob-request-attempt': '0',
             'x-api-blob-request-id': `fake:${Date.now()}:${requestId}`,
-            'x-api-version': '7',
+            'x-api-version': '8',
             'x-mpu-action': 'upload',
             'x-mpu-key': 'key',
             'x-mpu-upload-id': 'uploadId',
@@ -266,7 +266,7 @@ describe('client', () => {
             authorization: 'Bearer vercel_blob_client_fake_token_for_test',
             'x-api-blob-request-attempt': '0',
             'x-api-blob-request-id': `fake:${Date.now()}:${requestId}`,
-            'x-api-version': '7',
+            'x-api-version': '8',
             'x-mpu-action': 'complete',
             'x-mpu-key': 'key',
             'x-mpu-upload-id': 'uploadId',
@@ -349,7 +349,7 @@ describe('client', () => {
             authorization: 'Bearer vercel_blob_client_fake_token_for_test',
             'x-api-blob-request-attempt': '0',
             'x-api-blob-request-id': `fake:${Date.now()}:${requestId}`,
-            'x-api-version': '7',
+            'x-api-version': '8',
             'x-mpu-action': 'create',
           },
           method: 'POST',
@@ -366,7 +366,7 @@ describe('client', () => {
             authorization: 'Bearer vercel_blob_client_fake_token_for_test',
             'x-api-blob-request-attempt': '0',
             'x-api-blob-request-id': `fake:${Date.now()}:${requestId}`,
-            'x-api-version': '7',
+            'x-api-version': '8',
             'x-mpu-action': 'upload',
             'x-mpu-key': 'key',
             'x-mpu-upload-id': 'uploadId',
@@ -385,7 +385,7 @@ describe('client', () => {
             authorization: 'Bearer vercel_blob_client_fake_token_for_test',
             'x-api-blob-request-attempt': '0',
             'x-api-blob-request-id': `fake:${Date.now()}:${requestId}`,
-            'x-api-version': '7',
+            'x-api-version': '8',
             'x-mpu-action': 'upload',
             'x-mpu-key': 'key',
             'x-mpu-upload-id': 'uploadId',
@@ -408,7 +408,7 @@ describe('client', () => {
             authorization: 'Bearer vercel_blob_client_fake_token_for_test',
             'x-api-blob-request-attempt': '0',
             'x-api-blob-request-id': `fake:${Date.now()}:${requestId}`,
-            'x-api-version': '7',
+            'x-api-version': '8',
             'x-mpu-action': 'complete',
             'x-mpu-key': 'key',
             'x-mpu-upload-id': 'uploadId',

packages/blob/src/copy.ts

@@ -8,7 +8,7 @@ export interface CopyBlobResult {
   url: string;
   downloadUrl: string;
   pathname: string;
-  contentType?: string;
+  contentType: string;
   contentDisposition: string;
 }
 

packages/blob/src/put-helpers.ts

@@ -19,7 +19,7 @@ export interface PutBlobResult {
   url: string;
   downloadUrl: string;
   pathname: string;
-  contentType?: string;
+  contentType: string;
   contentDisposition: string;
 }