问题
Is it possible to use the HTML 5 File API (for example, this library: https://github.com/23/resumable.js ) in conjunction with the S3 multi-part upload feature?
http://docs.aws.amazon.com/AmazonS3/latest/dev/uploadobjusingmpu.html
回答1:
Yes, but you will need some kind of server backend to handle the Amazon API keys in a more secure way if you are going to make it part of a public website.
You can find what looks like a complete example implementation of this these projects:
- s3-multipart-upload-browser which uses a PHP backend
- s3_multipart which uses Ruby.
Please note that I have not used, tested or reviewed these projects.
A rough description of the sequence is as follows:
- User
- loads webpage
- selects file to upload
- hits upload button
- Webpage
- sends info about file to server
- Server
- creates multipart upload with Amazon API
- sends "key"(filename) and "upload id" back to Webpage
- Webpage
- works out size of parts
- requests Server to sign part passing "key", "upload id", part info
- Server
- signs a part request, sends "part upload url", "date" and "auth header"
- Webpage
- sends part data directly to Amazon S3 via "part upload url" using "date" and "auth header"
- keeps track of part ids
- Server & Webpage
- repeats 5 & 6 for each additional part, resuming if required
- Webpage
- makes "upload complete" request to server (passing all the part info)
- Server
- makes request to Amazon API to complete the creation of file
- Webpage
- inform user of error or success
Notes:
- If upload is aborted, this must also be handled server side else the parts / uploads started will be left to take up space in the S3 Bucket.
- It might take a few minutes to complete the "upload complete" request to Amazon.
来源：https://stackoverflow.com/questions/18075676/html5-and-amazon-s3-multi-part-uploads