Stripe global settings

[HungNgien]

Description: add fields in the global settings to input Stripe keys, allowing the billing information of organizers to be saved when the fields are filled.

This PR resolves #485

Summary by Sourcery

New Features:

• Allow organizers to save their billing information using Stripe Connect.

[sourcery-ai]

Reviewer's Guide by Sourcery

This pull request introduces new fields in the global settings to input Stripe keys, which allows the billing information of organizers to be saved when the fields are filled. It also adds a validator to ensure that the Stripe keys are in the correct format.

Class diagram for Stripe key validation and settings form

classDiagram
    class GlobalSettingsForm {
        +__init__(*args, **kwargs)
    }
    class StripeKeyValidator {
        -_prefixes: List[str]
        +__init__(prefix: Union[str, List[str]])
        +__call__(value: str)
    }
    class SecretKeySettingsField {
    }
    GlobalSettingsForm -- SecretKeySettingsField : uses
    GlobalSettingsForm -- StripeKeyValidator : uses
    note for GlobalSettingsForm "Added new Stripe Connect fields:
    - payment_stripe_connect_secret_key
    - payment_stripe_connect_publishable_key
    - payment_stripe_connect_test_secret_key
    - payment_stripe_connect_test_publishable_key"
    note for StripeKeyValidator "Validates Stripe keys
with specific prefixes:
- sk_live_, rk_live_
- pk_live_
- sk_test_, rk_test_
- pk_test_"

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Flow diagram for Stripe key validation process

flowchart TD
    A[Start Validation] --> B{Is key empty?}
    B -->|Yes| C[Raise ValidationError:
Key cannot be empty]
    B -->|No| D{Check key prefix}
    D -->|Valid prefix| E[Validation Success]
    D -->|Invalid prefix| F[Raise ValidationError:
Invalid key format]
    F --> G[Show error message with
expected prefix format]

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File-Level Changes

Change	Details	Files
Added fields for Stripe Connect secret and publishable keys, both for live and test modes.	Added 'payment_stripe_connect_secret_key' field. Added 'payment_stripe_connect_publishable_key' field. Added 'payment_stripe_connect_test_secret_key' field. Added 'payment_stripe_connect_test_publishable_key' field.	src/pretix/control/forms/global_settings.py
Added a validator to ensure that Stripe keys start with the correct prefix.	Created a 'StripeKeyValidator' class. The validator checks if the key starts with the expected prefix(es). The validator supports both single and multiple prefix validation.	src/pretix/control/forms/global_settings.py
Updated the 'stripe_webhook_secret_key' field label.	Changed the label of 'stripe_webhook_secret_key' to 'Stripe Webhook: Secret key'.	src/pretix/control/forms/global_settings.py

Assessment against linked issues

Issue	Objective	Addressed	Explanation
#485	Ensure the system works without dependency on the Stripe module	✅
#485	Add 2 new fields in global settings for admin to input Stripe keys	✅
#485	Enable organizer billing to use Stripe keys from global settings	✅

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