Python code for generating release apk automatically (Part 3)

makeApp(Part-3).py

import os
from subprocess import Popen, PIPE

# ...

# Function for creating keystore file
def createKeystore(item_dict):
    global input_key_filename
    global input_store_pass
    global input_key_alias
    global input_key_pass
    global keystore_exists

    if keystore_exists:
        # If keystore already exists, there is no need to create a new keystore
        if os.path.exists(constants.KEYSTORE_FOLDER + input_key_filename + '.jks'):
            print('\nKeystore file found!')
            return True

        # If keystore does not exist, and user did not give enough information
        # to create a new keystore, then we have nothing to do
        else:
            print(('\nNo keystore file is found with the given name,'
                + ' and you did not give enough information to create a new keystore.'))
            keystore_exists = False
            return False

    # If keystore already exists, there is no need to create a new keystore
    elif os.path.exists(constants.KEYSTORE_FOLDER + input_key_filename + '.jks'):
        print(('\nA keystore file is found with same name.'
            + ' So new keystore file will not be created and the existing keystore file will be used.'))
        keystore_exists = True
        return True

    keystore_exists = False

    print('\nCREATING keystore file...')
    cn = item_dict[constants.JSON_KEY_KEYSTORE_OWNER]
    ou = item_dict[constants.JSON_KEY_KEYSTORE_OU]
    o = item_dict[constants.JSON_KEY_ORGANIZATION]
    c = item_dict[constants.JSON_KEY_COUNTRY]

    process = Popen(('keytool -genkeypair -keyalg RSA -keysize 2048 -validity 20000 -dname "cn='
        + cn + ', ou=' + ou + ', o=' + o + ', c=' + c + '" -alias ' + input_key_alias
        + ' -keypass ' + input_key_pass + ' -keystore "' + constants.KEYSTORE_FOLDER + input_key_filename
        + '.jks" -storepass ' + input_store_pass), shell=True, stdout=PIPE, stderr=PIPE, universal_newlines=True)
    output, errors = process.communicate()

    # Non zero returncode means process error
    if process.returncode:
        # Show output and error for debugging purpose.
        # You can comment out the print statements if you want.
        print('keystore file creation output = ' + output)
        print('keystore file creation error = ' + errors)
        print('keystore file creation process return code = ' + str(process.returncode))
        print('Keystore file creation failed!')
        return False

    else:
        print('Keystore file created = ' + input_key_filename + '.jks')
        return True


# Function for saving keystore information in a file
def saveKeystoreInfo():
    global input_key_filename
    global input_store_pass
    global input_key_alias
    global input_key_pass

    # keystore_exists = True means a keystore file already existed and no new keystore was created
    if keystore_exists:
        return

    print('\nSaving keystore informations in a file...')
    with open(constants.KEYSTORE_FOLDER + input_key_filename + constants.KEYSTORE_PROPERTIES_FILE_NAME_SUFFIX, "w") as file_object:
        # Write keystore properties
        file_object.write('STORE_FILE=' + constants.KEYSTORE_FOLDER + input_key_filename + '.jks\n')
        file_object.write('KEY_STORE_PASSWORD=' + input_store_pass + '\n')
        file_object.write('KEY_ALIAS=' + input_key_alias + '\n')
        file_object.write('KEY_PASSWORD=' + input_key_pass + '\n')

    print('Keystore information saved')