🧱 reintegrate legacy API as possible fallback

Closes #335

Due to the failure in the last few days, I have reintegrated the old API, which can be activated via the follwoing environment variable:

NEXT_PUBLIC_LEGACY_MODE=true

@M4GNV5 has already expressed very justified concerns about the legal situation and the bundle size. Nevertheless, we should check this option, especially since we have relied on the old API in the last few days and this option should only be an alternative for emergencies.

Regarding the library, only a simple error message is shown, as this is not accessible via the old API.

localhost_3000_library_(iPhone 12 Pro)

`🤖 Generated by Copilot at 952aa47`

Summary

🔄🛠️📚

This pull request adds a fallback mode to the app that uses the old THI API when the new one is unavailable. It modifies several modules in the backend-utils, backend, and pages folders to switch between the APIs depending on a LEGACY_MODE constant. It also creates new modules in the backend-legacy-utils folder to handle the old THI API data. Additionally, it adds a new dependency postgres-array and a new translation key legacyWarning for the library page.

When the new API fails, we don't give up We switch to the LegacyAPI and load the data We use the backend-legacy-utils to parse and format _We rock the fallback mode with the LEGACY_MODE flag_

Walkthrough

Add a fallback mode for the app that uses the old THI API when the new one is not available (link, link, link, link, link, link, link, link, link, link, link, link, link, link, link, link, link, link, link, link, link, link, link, link, link, link, link, link, link, link, link, link, link, link, link, link, link, link, link, link, link, link, link)
- Define utility functions for fetching and parsing data from the old THI API in calendar-legacy-utils.js, grades-legacy-utils.js, rooms-legacy-utils.js, and timetable-legacy-utils.js (link, link, link)
- Import the LegacyAPI module from the backend-legacy-utils folder to access the old THI API endpoint (link, link, link, link)
- Import the utility functions from the backend-legacy-utils folder to use them in the backend-utils folder (link, link, link, link)
- Add conditional statements to the backend-utils functions that switch between the new and old THI API depending on the LEGACY_MODE constant (link, link, link, link, link)
- Export some constants and functions from the anonymous-api.js and authenticated-api.js modules that are used by the anonymous-legacy-api.js and authenticated-legacy-api.js modules (link, link, link)
- Define classes LegacyAnonymousAPIClient and LegacyAuthenticatedAPIClient that extend the AnonymousAPIClient and AuthenticatedAPIClient classes and override the request method to use the old THI API endpoint (link, link)
- Import the LegacyAPI module from the anonymous-legacy-api folder and define a LEGACY_MODE constant in the thi-session-handler.js module (link, link)
- Replace the API client with the api variable in the thi-session-handler.js module that switches between the new and old THI API depending on the LEGACY_MODE constant (link, link, link, link)
- Define a LEGACY_MODE constant in the lecturers.jsx, library.jsx, personal.jsx, and rooms/list.jsx pages that indicates whether the fallback mode is enabled or not (link, link, link, link)
- Add conditional statements to the load functions in the lecturers.jsx, library.jsx, personal.jsx, and rooms/list.jsx pages that switch between the new and old THI API depending on the LEGACY_MODE constant (link, link, link, link, link)
- Extract the main content of the library.jsx page into a separate component LibraryAppBody and add another component LegacyWarning that displays a warning message when the fallback mode is enabled (link, link)
- Add a new translation key legacyWarning to the German locale file for the library page that provides a localized message for the warning (link)
Add the postgres-array dependency to the package.json and package-lock.json files that is used by the calendar-legacy-utils.js module to parse the postgres array syntax returned by the old THI API (link, link, link)
Export some functions from the rooms-utils.js module that are used by the rooms-legacy-utils.js module to avoid code duplication and improve modularity (link, link, link)

neuland-ingolstadt / neuland.app