chore: normalise line endings to lf and enforce it

.editorconfig

@@ -0,0 +1,10 @@
+# Keeps editors from reintroducing CRLF. The enforcement is .gitattributes plus the CI
+# check; this is so a contributor's working tree does not fight it in the first place.
+root = true
+
+[*]
+end_of_line = lf
+charset = utf-8
+
+[*.{bat,cmd}]
+end_of_line = crlf

.gitattributes

@@ -0,0 +1,66 @@
+# Line endings are LF in the repository and in the working tree, on every platform.
+# Git applies this on `git add`, so a contributor's core.autocrlf setting cannot put CRLF
+# into the index. Adding this file does not fix what is already committed - that needs
+# `git add --renormalize .` once, which is what the commit introducing this file did.
+#
+# The extensions are listed explicitly rather than relying on `text=auto` alone: auto
+# detection is a heuristic, and this repository had files keep their CRLF for years despite
+# a `* text=auto eol=lf` rule. The CI check is the actual guarantee.
+
+* text=auto eol=lf
+
+# source and config
+*.java   text eol=lf
+*.kt     text eol=lf
+*.ts     text eol=lf
+*.tsx    text eol=lf
+*.js     text eol=lf
+*.jsx    text eol=lf
+*.mjs    text eol=lf
+*.cjs    text eol=lf
+*.json   text eol=lf
+*.jsonc  text eol=lf
+*.yml    text eol=lf
+*.yaml   text eol=lf
+*.xml    text eol=lf
+*.sql    text eol=lf
+*.avsc   text eol=lf
+*.md     text eol=lf
+*.txt    text eol=lf
+*.css    text eol=lf
+*.scss   text eol=lf
+*.html   text eol=lf
+*.properties text eol=lf
+*.sh     text eol=lf
+*.env    text eol=lf
+Dockerfile text eol=lf
+Makefile text eol=lf
+
+# read by cmd.exe, which wants CRLF
+*.bat text eol=crlf
+*.cmd text eol=crlf
+
+# never converted, never diffed
+*.png  binary
+*.jpg  binary
+*.jpeg binary
+*.gif  binary
+*.ico  binary
+*.webp binary
+*.svg  text eol=lf
+*.woff  binary
+*.woff2 binary
+*.ttf   binary
+*.otf   binary
+*.eot   binary
+*.pdf   binary
+*.zip   binary
+*.gz    binary
+*.tar   binary
+*.jar   binary
+*.wasm  binary
+*.glb   binary
+*.gltf  binary
+*.mp4   binary
+*.webm  binary
+*.avro  binary

.github/workflows/validate.yml

@@ -0,0 +1,19 @@
+name: validate
+on:
+  push:
+  workflow_dispatch:
+
+jobs:
+  line-endings:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - name: Check line endings
+        run: |
+          # .gitattributes normalises on add; this catches anything that slipped past it,
+          # including files committed before the rule existed. Fix with:
+          #   git add --renormalize . && git commit
+          if git ls-files --eol | grep -E '^i/(crlf|mixed)'; then
+            echo '::error::the files listed above have CRLF or mixed line endings in the index'
+            exit 1
+          fi

.gitignore

@@ -1,2 +1,2 @@
-.lh/
+.lh/
 .classpath

README.md

@@ -1,5 +1,5 @@
-# Event processor contract shared
-Git submodule for shared files of event-processor-contract implementation.
-
-- parent pom
+# Event processor contract shared
+Git submodule for shared files of event-processor-contract implementation.
+
+- parent pom
 - common AVRO schemata

src/main/avro/shared/realtime/notification.avsc

@@ -1,31 +1,31 @@
-{
-	"type": "record",
-	"name": "notification",
-	"namespace": "contracts",
-	"fields": [
-		{
-			"name": "id",
-			"type": "long"
-		},
-		{
-			"name": "blocknum",
-			"type": "long"
-		},
-		{
-			"name": "block_timestamp",
-			"type": "long"
-		},
-		{
-			"name": "account",
-			"type": "string"
-		},
-		{
-			"name": "context",
-			"type": "string"
-		},
-		{
-			"name": "data",
-			"type": "string"
-		}	
-	]
+{
+	"type": "record",
+	"name": "notification",
+	"namespace": "contracts",
+	"fields": [
+		{
+			"name": "id",
+			"type": "long"
+		},
+		{
+			"name": "blocknum",
+			"type": "long"
+		},
+		{
+			"name": "block_timestamp",
+			"type": "long"
+		},
+		{
+			"name": "account",
+			"type": "string"
+		},
+		{
+			"name": "context",
+			"type": "string"
+		},
+		{
+			"name": "data",
+			"type": "string"
+		}	
+	]
 }

src/main/avro/shared/realtime/realtime_event.avsc

@@ -1,43 +1,43 @@
-{
-	"type": "record",
-	"name": "realtime_event",
-	"namespace": "contracts",
-	"fields": [
-		{
-			"name": "blocknum",
-			"type": "long"
-		},
-		{
-			"name": "block_timestamp",
-			"type": "long"
-		},
-		{
-			"name": "global_sequence",
-			"type": "long"
-		},
-		{
-			"name": "asset_id",
-			"type": ["null","long"]
-		},
-		{
-			"name": "template_id",
-			"type": ["null","long"]
-		},
-		{
-			"name": "collection_id",
-			"type": "string"
-		},
-		{
-			"name": "context",
-			"type": "string"
-		},
-		{
-			"name": "type",
-			"type": "string"
-		},
-		{
-			"name": "data",
-			"type": ["null","string"]
-		}	
-	]
+{
+	"type": "record",
+	"name": "realtime_event",
+	"namespace": "contracts",
+	"fields": [
+		{
+			"name": "blocknum",
+			"type": "long"
+		},
+		{
+			"name": "block_timestamp",
+			"type": "long"
+		},
+		{
+			"name": "global_sequence",
+			"type": "long"
+		},
+		{
+			"name": "asset_id",
+			"type": ["null","long"]
+		},
+		{
+			"name": "template_id",
+			"type": ["null","long"]
+		},
+		{
+			"name": "collection_id",
+			"type": "string"
+		},
+		{
+			"name": "context",
+			"type": "string"
+		},
+		{
+			"name": "type",
+			"type": "string"
+		},
+		{
+			"name": "data",
+			"type": ["null","string"]
+		}	
+	]
 }