Android环境下Magento API的OAuth 1.0签名无效问题求助

First off, let’s address a likely syntax error in your Authorization header that’s probably contributing to this issue: looking at your code snippet, there’s an extra closing parenthesis ) at the end of the oauth_signature parameter. That’s definitely going to cause Magento to misinterpret the signature value—remove that first, then let’s dive into other common fixes.

If that doesn’t resolve the error, here are the most frequent culprits when all other OAuth parameters check out:

• Incorrect Signature Base String Construction
  Magento’s OAuth implementation is strict about the base string used to generate the HMAC-SHA1 signature. Double-check you’re following these rules to the letter:

  1. Start with the uppercase HTTP method (e.g., GET& or POST&).
  2. Append the URL-encoded full API endpoint URL (pay attention to trailing slashes—Magento often rejects mismatches here).
  3. Append & followed by all OAuth parameters (excluding oauth_signature) sorted lexicographically. Each key and value must be URL-encoded, joined with =, and separated by &.
     Even a tiny mistake (like wrong sorting, missing encoding, or a typo in the URL) will invalidate the signature.

• Signing Key Format Mistake
  The signing key for HMAC-SHA1 must be formatted as oauth_consumer_secret&oauth_token_secret. Even if your token secret is empty, you still need to include the ampersand (e.g., your_consumer_secret&). Missing that ampersand is one of the most common signature-related errors.

• Unencoded Signature in the Header
  The generated HMAC-SHA1 signature (a base64 string) must be URL-encoded when included in the Authorization header. If you’re passing the raw base64 value without encoding, Magento will reject it outright.

• Timestamp and Nonce Validity

  • Ensure your device’s clock is synchronized with Magento’s server time—if the timestamp is more than 15 minutes off (Magento’s default window), the signature will be rejected.
  • Nonces must be unique for every request with the same timestamp. Reusing a nonce even once will trigger this error.

• Magento Admin Configuration Checks

  • Verify that your consumer key/secret and token/secret exactly match what’s set in Magento’s admin under System > Web Services > REST OAuth Consumers.
  • Confirm the consumer has the correct resource permissions for the API endpoint you’re calling—sometimes permission issues can masquerade as signature errors.

To debug further, log the exact base string you’re using to generate the signature, then use an OAuth 1.0a debugger to generate a valid signature for the same parameters. Comparing the two will help you spot where your logic differs.

内容的提问来源于stack exchange，提问作者Subin Babu