Case-insensitive webfinger response. Fixes #1955 & #1986

[Kradyz]

Case-insensitive webfinger response

• The webfinger regex in crates/utils/src/settings/mod.rs has been modified so that the server will no longer reject requests containing A-Z characters.

Case-insensitive database search

• The sql_function “lower” has been added to crates/db_schema/src/lib.rs. This function allows one to perform a database searches applying lower(column) operations with diesel.

• In /crates/db_schema/Cargo.toml, the [lib] block has been updated to be able to import the lib.rs functions.

• The lower function is loaded by lemmy/crates/db_schema/src/impls/person.rs and lemmy/crates/db_schema/src/impls/community.rs, and used to perform a case-insensitive database searches via find_by_name and read_from_name, respectively. This allows the webfinger response to be case insensitive.

Include uppercase characters in the API_tests

• The randomString generation function in api_tests/src/shared.ts has been updated to include uppercase characters when running tests.

Field tests

The user Sal can now be viewed in lemmy.ml:
https://lemmy.ml/u/Sal@mander.xyz

The following curls will trigger the correct webfinger responses for the user Sal and for the community main.

curl "https://mander.xyz/.well-known/webfinger?resource=acct:SaL@mander.xyz"
curl "https://mander.xyz/.well-known/webfinger?resource=acct:sal@mander.xyz"

curl "https://mander.xyz/.well-known/webfinger?resource=acct:main@mander.xyz"
curl "https://mander.xyz/.well-known/webfinger?resource=acct:MAIN@mander.xyz"

I have performed mastodon searches to fetch content as well, and the searches are now case-insensitive.

This commit would replace #2000. LemmyNet/lemmy-ui#525 can be reversed as users should be able to use uppercase names without problem. Issues #1955 and #1986 will be solved.

[dessalines]

This shouldn't be necessary, diesel already has a lower function, you just have to import it. https://docs.diesel.rs/diesel/query_dsl/trait.QueryDsl.html?search=lower#method.select

[Kradyz]

I chose this method after reading a possibly oudated answer to diesel-rs/diesel#560, and this section of the manual.

I have tried to find specifically where I should load this function from, but in their internal tests and in the examples that I have found the function is defined locally wherever it is called.

The only place where I see the function defined under diesel:: is here, where it is defined to be used locally for a test. I don't know if it is correct to import the function from there.

I have checked the source of QueryDsl and I can't find the method defined there.

[dessalines]

Ah my bad, I'd assumed it was one of their expression methods. That's right that you do have to add that sql_function then.