Audible API in C#

Implementation of an Audible API in C#. Aside from the goal of having this be pure C#, the focus on this project was to have it

1. fully integratable into other software
2. fully testable and tested

...or just tell more friends. As long as I'm maintaining this software, it will remain free and open source.

Thanks to these other Audible APIs which I used for reference and whose authors were very responsive and helpful with questions:

https://github.com/omarroth/audible.cr -- Crystal interface for Audible's internal API
https://github.com/mkb79/Audible -- Python interface for Audible's internal API

The main functionality of this API is typically kept very up to date. It is the backbone of my popular-ish audible library manager Libation. Although some tests and demo code are probably outdated by now, I'm happy to answer questions though in the issues page.

Anything you do will start with a call to AudibleApi.EzApiCreator.GetApiAsync. This async method will return an instance of the api object which you will use for everything else. When login info is needed, it will be processed by the ILoginCallback class you specify.

AudibleApiClientExample provides some quick and dirty examples. It's what I use for quick tests so there are scraps of examples throughout.

AudibleApiClientExample.LoginCallback provides a proof of concept for a command line callback class.

AudibleApiClientExample.AudibleApiClient shows how to create the api object which is then used in _Main.run

Since the API is undocumented, it can at times be difficult to tell how to use it. The links above have some good findings. I've found "response_groups" particularly difficult to figure out. To be safe, you can just include them all. All info below is based on analysis of using these response_groups on a library of 700+ titles.

Included in all groups: asin, purchase_date, sku_lite, status

Additional fields:

• Default/no response_groups provided: authors, available_codecs, category_ladders, content_delivery_type, content_type, format_type, has_children, is_adult_product, is_listenable, issue_date, language, merchandising_summary, narrators, product_images, publisher_name, release_date, runtime_length_min, subtitle, thesaurus_subject_keywords, title, pdf_link, pdf_url, publication_name, content_rating
• badge_types: origin_id, origin_marketplace, origin_type
• category_ladders: category_ladders
• contributors: authors, narrators, publisher_name
• is_downloaded, is_downloaded
• is_returnable: available_codecs, content_delivery_type, content_type, format_type, has_children, is_adult_product, is_listenable, is_returnable, issue_date, language, merchandising_summary, origin_id, origin_marketplace, origin_type, release_date, runtime_length_min, thesaurus_subject_keywords, publication_name, content_rating
• media: product_images
• origin_asin: origin_asin, origin_id, origin_marketplace, origin_type
• pdf_url: pdf_link, pdf_url. (The value of pdf_link and pdf_url seems to always be identical)
• percent_complete: available_codecs, content_delivery_type, content_type, format_type, has_children, is_adult_product, is_listenable, issue_date, language, merchandising_summary, origin_asin, origin_id, origin_marketplace, origin_type, percent_complete, release_date, runtime_length_min, thesaurus_subject_keywords, publication_name, content_rating
• price: price
• product_attrs: available_codecs, content_delivery_type, content_type, format_type, has_children, is_adult_product, is_listenable, issue_date, language, merchandising_summary, release_date, runtime_length_min, thesaurus_subject_keywords, publication_name, content_rating
• product_desc: subtitle, title
• product_extended_attrs: publisher_summary, editorial_reviews, audible_editors_summary
• product_plans: plans
• rating: rating
• relationships: relationships
• reviews: customer_reviews
• sample: sample_url
• series: series
• sku: sku

Strange response_groups:

• provided_review: provided_review. However, provides no results unless used with "rating"
• I can find no combination which gives these response_groups do anything meaningful: claim_code_url, product_plan_details, review_attrs