bool S3fsCred::ParsePasswdFile()

in src/s3fs_cred.cpp [557:644]
76 lines of code
16 McCabe index (conditional complexity)

bool S3fsCred::ParsePasswdFile(bucketkvmap_t& resmap)
{
    std::string          line;
    size_t               first_pos;
    readline_t           linelist;
    readline_t::iterator iter;

    // open passwd file
    std::ifstream PF(passwd_file.c_str());
    if(!PF.good()){
        S3FS_PRN_EXIT("could not open passwd file : %s", passwd_file.c_str());
        return false;
    }

    // read each line
    while(getline(PF, line)){
        line = trim(line);
        if(line.empty()){
            continue;
        }
        if('#' == line[0]){
            continue;
        }
        if(std::string::npos != line.find_first_of(" \t")){
            S3FS_PRN_EXIT("invalid line in passwd file, found whitespace character.");
            return false;
        }
        if('[' == line[0]){
            S3FS_PRN_EXIT("invalid line in passwd file, found a bracket \"[\" character.");
            return false;
        }
        linelist.push_back(line);
    }

    // read '=' type
    kvmap_t kv;
    for(iter = linelist.begin(); iter != linelist.end(); ++iter){
        first_pos = iter->find_first_of('=');
        if(first_pos == std::string::npos){
            continue;
        }
        // formatted by "key=val"
        std::string key = trim(iter->substr(0, first_pos));
        std::string val = trim(iter->substr(first_pos + 1, std::string::npos));
        if(key.empty()){
            continue;
        }
        if(kv.end() != kv.find(key)){
            S3FS_PRN_WARN("same key name(%s) found in passwd file, skip this.", key.c_str());
            continue;
        }
        kv[key] = val;
    }
    // set special key name
    resmap[S3fsCred::KEYVAL_FIELDS_TYPE] = kv;

    // read ':' type
    for(iter = linelist.begin(); iter != linelist.end(); ++iter){
        first_pos       = iter->find_first_of(':');
        size_t last_pos = iter->find_last_of(':');
        if(first_pos == std::string::npos){
            continue;
        }
        std::string bucketname;
        std::string accesskey;
        std::string secret;
        if(first_pos != last_pos){
            // formatted by "bucket:accesskey:secretkey"
            bucketname= trim(iter->substr(0, first_pos));
            accesskey = trim(iter->substr(first_pos + 1, last_pos - first_pos - 1));
            secret    = trim(iter->substr(last_pos + 1, std::string::npos));
        }else{
            // formatted by "accesskey:secretkey"
            bucketname= S3fsCred::ALLBUCKET_FIELDS_TYPE;
            accesskey = trim(iter->substr(0, first_pos));
            secret    = trim(iter->substr(first_pos + 1, std::string::npos));
        }
        if(resmap.end() != resmap.find(bucketname)){
            S3FS_PRN_EXIT("there are multiple entries for the same bucket(%s) in the passwd file.", (bucketname.empty() ? "default" : bucketname.c_str()));
            return false;
        }
        kv.clear();
        kv[S3fsCred::KEY_ACCESSKEYID] = accesskey;
        kv[S3fsCred::KEY_SECRETKEY]   = secret;
        resmap[bucketname] = kv;
    }
    return true;
}