Widevine Factory Extraction Tool

This tool extracts the BCC and generates the Certificate Signing Request (CSR)
needed to be uploaded for Prov4 device registration.

CSR extraction instructions:

1. Prepare the example_main.cpp file:
    - Write or modify the main() function in example_main.cpp according to your
      needs.
    - Ensure that all required fields in the client_info structure are filled in
      correctly. Refer to the comments within the main() function in
      example_main.cpp for detailed instructions and field descriptions.

2. Compile:
    - Option 1: Command-line compilation
        - Under the directory factory_upload_tool/ce, run:
           clang++ *.cpp ../common/src/*.cpp ../../util/src/string_conversions.cpp -ldl -rdynamic -I../../util/include -I../../oemcrypto/include -I../common/include -o wv_factory_extractor
           This command compiles all .cpp files into an executable named
           wv_factory_extractor in current directory.
    - Option 2: Using the provided Makefile
        - Under the directory factory_upload_tool/ce, run:
           `make all`
        - To enable the BCC validator, compile with:
           `make USE_VALIDATOR=y all`
            Note that the BCC validator takes dependency of `cppbor` and
            `boringssl` library from `third_party` directory.
        - The compiled executable will be located in the out/wv_factory_extractor
          directory under the CDM root directory.

3. Specify the location of liboemcrypto.so:
    - Replacing /path/to/ with the actual path to the liboemcrypto.so file:
        export LIBOEMCRYPTO_PATH=/path/to/liboemcrypto.so

4. Run the wv_factory_extractor tool:
    - To output the CSR to a file ready for uploading, under the output
      directory, run
       `./wv_factory_extractor > csr.json`
    - To run BCC validation and view the results in console output, run
       `./wv_factory_extractor --validate`
    - If BCC validator is enabled at compile time, it will print the parsed BCC
      and the validation results.

Uploading instructions:

1. Upload the `csr.json` file:
    - Upload the `csr.json` file using the following command:
        python3 upload.py --credentials=cred.json --org-name={your organization name} --json-csr=csr.json
        - Replace cred.json with the path to your OAuth 2.0 client credentials
          file. You can obtain this file through the Google Cloud Platform.
        - Replace {your organization name} with the name of your organization.