Environmental preparation
The RESTful API interface provided by OSS follows the HTTP protocol, so any language and tool can use OSS services as long as it sends legal HTTP requests according to the rules defined in the OSS API document. If you don't want to do your own in-depth development, you can directly use the SDK provided by OSS (download page:). There are currently three languages to choose from: Python, PHP and Java. This article will take Python SDK as an example. Note: SDK in other languages may differ from the examples in this article in function names. For more information, please refer to the corresponding SDK documentation. , explain the use skills of OSS for everyone.
If your system supports Python 2.7, the deployment of Python's OSS development environment is very simple: put a few *. The py file is placed in the SDK under the development directory, and the following two lines are added to the code to fill the Alibaba Cloud homepage.
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With the Access ID and Access Key obtained when registering on, you can use the functions declared in the SDK through the object my_store.
Read and write files on cloud storage
Delete functions such as fopen () and fclose () from the code! Instead, it is a RESTful HTTP request: write file is PUT, read file is GET, get file property is HEAD, and DELETE file is DELETE. In the built OSS Python development environment, the code for directly creating and writing a new file (OSS is called object) using the my_store object declared in the previous step is as follows:
In the above example, the content_type can be filled with a file type specified in the HTTP protocol as needed. For example, JPG images use "Image /jpeg" and MP3 files use "Audio /mpeg". Please refer to RFC 26 16 for the specific definition. Choosing the right content type can make other Internet applications directly and correctly use the files on OSS.
The code for reading an existing file is as follows:
The code for obtaining file attributes is as follows:
The code for deleting files is as follows:
Through the four simple functions listed above, you can easily transplant applications built on traditional file systems to OSS, a cloud storage platform.
By signing the URL anti-theft chain
Because the network bandwidth quality of OSS is very good, many friends hope to develop websites and applications such as pictures, music and videos based on OSS. But how to effectively prevent theft chain is a headache. Here is a simple and safe way: anti-theft chain through signature URL.
First of all, make sure that your bucket permissions are private, that is, all requests of this bucket must be signed and authenticated before they can be considered legal. Then dynamically generate a signed URL according to the operation type, the bucket to be accessed, the object to be accessed and the timeout. With this signature URL, your authorized users can perform corresponding actions before the signature URL expires.
The signed Python code is as follows:
The method can be any one of PUT, GET, HEAD and DELETE; The last parameter "Timeout" is the timeout in seconds. The signature URL calculated by the Python method above is:
Through this method of dynamically calculating the signature URL, the data placed on OSS can be effectively protected from being stolen by others.
Only when certain conditions are met will data be transmitted.
IMS(If-Modified-Since) parameter is often used in HTTP protocol. Its significance is: through this timestamp parameter, the server can judge whether the data of the client is the latest; If it is not the latest, the data on the server side is returned; If it is the latest, it returns to 304, telling the client that the page in its local cache is the latest, so the client can load data directly from the local. In this way, the amount of data transmitted on the network will be greatly reduced, and the burden on the server will be reduced.
Including IMS, OSS*** supports four kinds of conditional transmission parameters. Only when the attributes of the object meet the conditions given by the client, OSS transmits the data of the object. These four parameters are:
If-modify-self
If-not modified-because
If there is a match
If it doesn't match.
The meaning of If-Modified-Since is just the opposite of If-Modified-Since: if the content is not updated, the data is returned; Otherwise, HTTP status code 304 is returned. If-Unmodified-Since and If-Modified-Since can be used together to specify a time window.