Add even more validators (#385)

* Add even more validators

I was gonna add shaderpacks too, but those have no standard metadata file at all.

* Make it compile

* Fix logic

* Update validators

* fix mistake

Co-authored-by: Geometrically <18202329+Geometrically@users.noreply.github.com>

src/validate/modpack.rs

@@ -0,0 +1,105 @@
+use crate::models::pack::{PackFileHash, PackFormat};
+use crate::util::validate::validation_errors_to_string;
+use crate::validate::{
+    SupportedGameVersions, ValidationError, ValidationResult,
+};
+use std::io::{Cursor, Read};
+use std::path::Component;
+use validator::Validate;
+use zip::ZipArchive;
+
+pub struct ModpackValidator;
+
+impl super::Validator for ModpackValidator {
+    fn get_file_extensions(&self) -> &[&str] {
+        &["mrpack"]
+    }
+
+    fn get_project_types(&self) -> &[&str] {
+        &["modpack"]
+    }
+
+    fn get_supported_loaders(&self) -> &[&str] {
+        &["forge", "fabric", "quilt"]
+    }
+
+    fn get_supported_game_versions(&self) -> SupportedGameVersions {
+        SupportedGameVersions::All
+    }
+
+    fn validate(
+        &self,
+        archive: &mut ZipArchive<Cursor<bytes::Bytes>>,
+    ) -> Result<ValidationResult, ValidationError> {
+        let pack: PackFormat = {
+            let mut file =
+                archive.by_name("modrinth.index.json").map_err(|_| {
+                    ValidationError::InvalidInput(
+                        "Pack manifest is missing.".into(),
+                    )
+                })?;
+
+            let mut contents = String::new();
+            file.read_to_string(&mut contents)?;
+
+            serde_json::from_str(&contents)?
+        };
+
+        pack.validate().map_err(|err| {
+            ValidationError::InvalidInput(
+                validation_errors_to_string(err, None).into(),
+            )
+        })?;
+
+        if pack.game != "minecraft" {
+            return Err(ValidationError::InvalidInput(
+                format!("Game {0} does not exist!", pack.game).into(),
+            ));
+        }
+
+        for file in &pack.files {
+            if file.hashes.get(&PackFileHash::Sha1).is_none() {
+                return Err(ValidationError::InvalidInput(
+                    "All pack files must provide a SHA1 hash!".into(),
+                ));
+            }
+
+            if file.hashes.get(&PackFileHash::Sha512).is_none() {
+                return Err(ValidationError::InvalidInput(
+                    "All pack files must provide a SHA512 hash!".into(),
+                ));
+            }
+
+            let path = std::path::Path::new(&file.path)
+                .components()
+                .next()
+                .ok_or_else(|| {
+                    ValidationError::InvalidInput(
+                        "Invalid pack file path!".into(),
+                    )
+                })?;
+
+            match path {
+                Component::CurDir | Component::Normal(_) => {}
+                _ => {
+                    return Err(ValidationError::InvalidInput(
+                        "Invalid pack file path!".into(),
+                    ))
+                }
+            };
+        }
+
+        Ok(ValidationResult::PassWithPackDataAndFiles {
+            format: pack,
+            files: archive
+                .file_names()
+                .filter(|x| {
+                    x.starts_with("overrides/mods")
+                        || x.starts_with("client-overrides/mods")
+                        || x.starts_with("server-overrides/mods")
+                })
+                .flat_map(|x| x.rsplit('/').next().map(|x| x.to_string()))
+                .collect::<Vec<String>>(),
+        })
+    }
+}