Move to SPDX licenses (#449)

* Move to SPDX licenses

Found a way to do this without breaking API compat, so here it is, instead of waiting for v3

Resolves MOD-129
Resolves #396

* License URL updates

* what was I thinking

* Do a thing

* Add open source filter

* Remove dead imports

* Borrow

* Update 20220910132835_spdx-licenses.sql

* Add license text route

* Update migration

* Address comments

Cargo.toml

@@ -59,6 +59,7 @@ itertools = "0.10.5"
 validator = { version = "0.16.0", features = ["derive", "phone"] }
 regex = "1.6.0"
 censor = "0.2.0"
+spdx = { version = "0.9.0", features = ["text"] }
 
 dotenvy = "0.15.6"
 log = "0.4.17"

migrations/20221126222222_spdx-licenses.sql

@@ -0,0 +1,27 @@
+ALTER TABLE mods ADD COLUMN license_new varchar(2048) DEFAULT 'LicenseRef-All-Rights-Reserved' NOT NULL;
+
+UPDATE mods SET license_new = licenses.short FROM licenses WHERE mods.license = licenses.id;
+
+UPDATE mods SET license_new = 'LicenseRef-Custom' WHERE license_new = 'custom';
+UPDATE mods SET license_new = 'LicenseRef-All-Rights-Reserved' WHERE license_new = 'arr';
+UPDATE mods SET license_new = 'Apache-2.0' WHERE license_new = 'apache';
+UPDATE mods SET license_new = 'BSD-2-Clause' WHERE license_new = 'bsd-2-clause';
+UPDATE mods SET license_new = 'BSD-3-Clause' WHERE license_new = 'bsd-3-clause' OR license_new = 'bsd';
+UPDATE mods SET license_new = 'CC0-1.0' WHERE license_new = 'cc0';
+UPDATE mods SET license_new = 'Unlicense' WHERE license_new = 'unlicense';
+UPDATE mods SET license_new = 'MIT' WHERE license_new = 'mit';
+UPDATE mods SET license_new = 'LGPL-3.0-only' WHERE license_new = 'lgpl-3';
+UPDATE mods SET license_new = 'LGPL-2.1-only' WHERE license_new = 'lgpl-2.1' OR license_new = 'lgpl';
+UPDATE mods SET license_new = 'MPL-2.0' WHERE license_new = 'mpl-2';
+UPDATE mods SET license_new = 'ISC' WHERE license_new = 'isc';
+UPDATE mods SET license_new = 'Zlib' WHERE license_new = 'zlib';
+UPDATE mods SET license_new = 'GPL-2.0-only' WHERE license_new = 'gpl-2';
+UPDATE mods SET license_new = 'GPL-3.0-only' WHERE license_new = 'gpl-3';
+UPDATE mods SET license_new = 'AGPL-3.0-only' WHERE license_new = 'agpl';
+
+UPDATE mods SET license_url = NULL WHERE license_url LIKE 'https://cdn.modrinth.com/licenses/%';
+
+ALTER TABLE mods DROP COLUMN license;
+ALTER TABLE mods RENAME COLUMN license_new TO license;
+
+DROP TABLE licenses;