zhgoh / mail_fetch_encrypt Goto Github PK

Create a C++ console application to retrieve items in specific Gmail mailbox (filtered by specified period of time) and store them in the same folder in encrypted form (algorithm should be chosen by yourself).

Parameters are: mailbox name, mailbox password, start of the retrieval period, end of the retrieval period.

You need to use official API provided by Google, no IMAP/POP3.

Download mails and save as encrypted format:

folder: inbox/draft/sent/etc
start: YYYY-MM-DD
end:   YYYY-MM-DD
$> ./app ./secrets.json [folder] [start date] [end date] 

Decrypt mails:

$> ./app

To use this project, certain files are needed but I am providing it with the project for ease of testing.

1. roots.pem - Provided by google API
2. secrets.json - Create and download a new credentials from https://console.developers.google.com/
3. rsa_privkey.pem - Generated with openssl genrsa -out rsa_privkey.pem 1024
4. rsa_pubkey.pem - Generated with openssl rsa -pubout -in rsa_privkey.pem -out rsa_pubkey.pem

This application will download mails from GMail, encrypt the mails and store it into a folder named messages. You can use the same application to decrypt the messages.

# Generate private key
$ openssl genrsa -out rsa_privkey.pem 1024

# Generate public key from private key
$ openssl rsa -pubout -in rsa_privkey.pem -out rsa_pubkey.pem

I took the reference code from this stack overflow link

• Missing function
• Function Signature mismatch

Some things to not is Google API generator for c++ is broken. The first issue is commonly in some of the files, (message.cc, message_part.cc) Example of a missing function.

Fix: Just write the missing functions, the functions are quite trival and just access Storage.

const MessagePart Message::get_payload() const
{
    const Json::Value &storage = Storage("payload");
    return client::JsonValueToCppValueHelper<MessagePart>(storage);
}

Another issue is that there is some function signature mismatched caused by the generator, see this issue google/google-api-cpp-client#41

Fix: (gmail_service.cc). Note: line 2 uses string instead of StringPiece for the generated code which does not override the parent class properly.

util::Status UsersResource_GetProfileMethod::AppendVariable(
            const string &variable_name,
            const client::UriTemplateConfig &config,
            string *target)
    {