From 2315a68543b1cb3b7064742d3f931bd82785cf2d Mon Sep 17 00:00:00 2001
From: Matthias Beyer <mail@beyermatthias.de>
Date: Tue, 31 Dec 2019 13:16:04 +0100
Subject: Impl Ref for MutRefWithHasher

Signed-off-by: Matthias Beyer <mail@beyermatthias.de>
---
 lib/entry/libimagentryref/src/reference.rs | 102 +++++++++++++++++++++++++++++
 1 file changed, 102 insertions(+)

diff --git a/lib/entry/libimagentryref/src/reference.rs b/lib/entry/libimagentryref/src/reference.rs
index 0d8970f7..595962c4 100644
--- a/lib/entry/libimagentryref/src/reference.rs
+++ b/lib/entry/libimagentryref/src/reference.rs
@@ -272,6 +272,108 @@ pub trait MutRef {
         -> Result<()>
         where P: AsRef<Path>,
               Coll: AsRef<str>;
+
+}
+
+impl<'a, H: Hasher> Ref for MutRefWithHasher<'a, H> {
+
+    /// Check whether the underlying object is actually a ref
+    fn is_ref(&self) -> Result<bool> {
+        self.0.is::<IsRef>().context("Failed to check is-ref flag").map_err(Error::from)
+    }
+
+    fn get_hash(&self) -> Result<&str> {
+        let header_path = format!("ref.hash.{}", H::NAME);
+        self.0
+            .get_header()
+            .read(&header_path)
+            .context(format_err!("Failed to read header at '{}'", header_path))
+            .map_err(Error::from)?
+            .ok_or_else(|| {
+                Error::from(EM::EntryHeaderFieldMissing("ref.hash.<hash>"))
+            })
+            .and_then(|v| {
+                v.as_str().ok_or_else(|| {
+                    Error::from(EM::EntryHeaderTypeError2("ref.hash.<hash>", "string"))
+                })
+            })
+    }
+
+    /// Get the path of the actual file
+    fn get_path(&self, config: &Config) -> Result<PathBuf> {
+        let basepath_name = self.0
+            .get_header()
+            .read_string("ref.basepath")?
+            .ok_or_else(|| Error::from(EM::EntryHeaderFieldMissing("ref.basepath")))?;
+
+        self.get_path_with_basepath_setting(config, basepath_name)
+    }
+
+    fn get_path_with_basepath_setting<B>(&self, config: &Config, base: B)
+        -> Result<PathBuf>
+            where B: AsRef<str>
+    {
+        let relpath = self.0
+            .get_header()
+            .read_string("ref.relpath")?
+            .map(PathBuf::from)
+            .ok_or_else(|| Error::from(EM::EntryHeaderFieldMissing("ref.relpath")))?;
+
+        get_file_path(config, base.as_ref(), relpath)
+    }
+
+    /// Get the relative path, relative to the configured basepath
+    fn get_relative_path(&self) -> Result<PathBuf> {
+        self.0
+            .get_header()
+            .read("ref.relpath")
+            .context("Failed to read header at 'ref.relpath'")?
+            .ok_or_else(|| Error::from(EM::EntryHeaderFieldMissing("ref.relpath")))
+            .and_then(|v| {
+                v.as_str()
+                    .ok_or_else(|| EM::EntryHeaderTypeError2("ref.relpath", "string"))
+                    .map_err(Error::from)
+            })
+            .map(PathBuf::from)
+    }
+
+    fn hash_valid(&self, config: &Config) -> Result<bool> {
+        let ref_header = self.0
+            .get_header()
+            .read("ref")
+            .context("Failed to read header at 'ref'")?
+            .ok_or_else(|| err_msg("Header missing at 'ref'"))?;
+
+        let basepath_name = ref_header
+            .read("basepath")
+            .context("Failed to read header at 'ref.basepath'")?
+            .ok_or_else(|| err_msg("Header missing at 'ref.basepath'"))?
+            .as_str()
+            .ok_or_else(|| Error::from(EM::EntryHeaderTypeError2("ref.hash.<hash>", "string")))?;
+
+        let path = ref_header
+            .read("relpath")
+            .context("Failed to read header at 'ref.relpath'")?
+            .ok_or_else(|| err_msg("Header missing at 'ref.relpath'"))?
+            .as_str()
+            .map(PathBuf::from)
+            .ok_or_else(|| Error::from(EM::EntryHeaderTypeError2("ref.hash.<hash>", "string")))?;
+
+
+        let file_path = get_file_path(config, basepath_name, &path)?;
+
+        ref_header
+            .read(H::NAME)
+            .context(format_err!("Failed to read header at 'ref.{}'", H::NAME))?
+            .ok_or_else(|| format_err!("Header missing at 'ref.{}'", H::NAME))
+            .and_then(|v| {
+                v.as_str().ok_or_else(|| {
+                    Error::from(EM::EntryHeaderTypeError2("ref.hash.<hash>", "string"))
+                })
+            })
+            .and_then(|hash| H::hash(file_path).map(|h| h == hash))
+    }
+
 }
 
 
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