Shader fixes (#495)

* Shader fixes

* Add core shaders validator

* Update validator again

* Rename shaders

* Fix build

src/validate/shader.rs

@@ -0,0 +1,119 @@
+use crate::validate::{
+    SupportedGameVersions, ValidationError, ValidationResult,
+};
+use std::io::Cursor;
+use zip::ZipArchive;
+
+pub struct ShaderValidator;
+
+impl super::Validator for ShaderValidator {
+    fn get_file_extensions(&self) -> &[&str] {
+        &["zip"]
+    }
+
+    fn get_project_types(&self) -> &[&str] {
+        &["shader"]
+    }
+
+    fn get_supported_loaders(&self) -> &[&str] {
+        &["optifine", "iris"]
+    }
+
+    fn get_supported_game_versions(&self) -> SupportedGameVersions {
+        SupportedGameVersions::All
+    }
+
+    fn validate(
+        &self,
+        archive: &mut ZipArchive<Cursor<bytes::Bytes>>,
+    ) -> Result<ValidationResult, ValidationError> {
+        if !archive.file_names().any(|x| x.starts_with("shaders/")) {
+            return Err(ValidationError::InvalidInput(
+                "No shaders folder present for OptiFine/Iris shader.".into(),
+            ));
+        }
+
+        Ok(ValidationResult::Pass)
+    }
+}
+
+pub struct CanvasShaderValidator;
+
+impl super::Validator for CanvasShaderValidator {
+    fn get_file_extensions(&self) -> &[&str] {
+        &["zip"]
+    }
+
+    fn get_project_types(&self) -> &[&str] {
+        &["shader"]
+    }
+
+    fn get_supported_loaders(&self) -> &[&str] {
+        &["canvas"]
+    }
+
+    fn get_supported_game_versions(&self) -> SupportedGameVersions {
+        SupportedGameVersions::All
+    }
+
+    fn validate(
+        &self,
+        archive: &mut ZipArchive<Cursor<bytes::Bytes>>,
+    ) -> Result<ValidationResult, ValidationError> {
+        archive.by_name("pack.mcmeta").map_err(|_| {
+            ValidationError::InvalidInput(
+                "No pack.mcmeta present for pack file. Tip: Make sure pack.mcmeta is in the root directory of your pack!".into(),
+            )
+        })?;
+
+        if !archive.file_names().any(|x| x.contains("/pipelines/")) {
+            return Err(ValidationError::InvalidInput(
+                "No pipeline shaders folder present for canvas shaders.".into(),
+            ));
+        }
+
+        Ok(ValidationResult::Pass)
+    }
+}
+
+pub struct CoreShaderValidator;
+
+impl super::Validator for CoreShaderValidator {
+    fn get_file_extensions(&self) -> &[&str] {
+        &["zip"]
+    }
+
+    fn get_project_types(&self) -> &[&str] {
+        &["shader"]
+    }
+
+    fn get_supported_loaders(&self) -> &[&str] {
+        &["vanilla"]
+    }
+
+    fn get_supported_game_versions(&self) -> SupportedGameVersions {
+        SupportedGameVersions::All
+    }
+
+    fn validate(
+        &self,
+        archive: &mut ZipArchive<Cursor<bytes::Bytes>>,
+    ) -> Result<ValidationResult, ValidationError> {
+        archive.by_name("pack.mcmeta").map_err(|_| {
+            ValidationError::InvalidInput(
+                "No pack.mcmeta present for pack file. Tip: Make sure pack.mcmeta is in the root directory of your pack!".into(),
+            )
+        })?;
+
+        if !archive
+            .file_names()
+            .any(|x| x.starts_with("assets/minecraft/shaders/"))
+        {
+            return Err(ValidationError::InvalidInput(
+                "No shaders folder present for vanilla shaders.".into(),
+            ));
+        }
+
+        Ok(ValidationResult::Pass)
+    }
+}