From a2e0f5c4f86d6c6a5a0a76e21aa30bca89e9d8a4 Mon Sep 17 00:00:00 2001
From: Vincent JAILLOT <vjaillot@cirilgroup.com>
Date: Fri, 2 Jun 2023 12:56:26 +0200
Subject: [PATCH] fix(CRS): more robust parameter tests

---
 src/Core/Geographic/Crs.js | 23 +++++++++++++++++++----
 src/Source/TMSSource.js    |  2 +-
 2 files changed, 20 insertions(+), 5 deletions(-)

diff --git a/src/Core/Geographic/Crs.js b/src/Core/Geographic/Crs.js
index cdd70936b4..b7c40cfc4f 100644
--- a/src/Core/Geographic/Crs.js
+++ b/src/Core/Geographic/Crs.js
@@ -2,19 +2,31 @@ import proj4 from 'proj4';
 
 proj4.defs('EPSG:4978', '+proj=geocent +datum=WGS84 +units=m +no_defs');
 
+function isString(s) {
+    return typeof s === 'string' || s instanceof String;
+}
+
+function mustBeString(crs) {
+    if (!isString(crs)) {
+        throw new Error(`Crs parameter value must be a string: '${crs}'`);
+    }
+}
+
 function isTms(crs) {
-    return crs.startsWith('TMS');
+    return isString(crs) && crs.startsWith('TMS');
 }
 
 function isEpsg(crs) {
-    return crs.startsWith('EPSG');
+    return isString(crs) && crs.startsWith('EPSG');
 }
 
 function formatToTms(crs) {
+    mustBeString(crs);
     return isTms(crs) ? crs : `TMS:${crs.match(/\d+/)[0]}`;
 }
 
 function formatToEPSG(crs) {
+    mustBeString(crs);
     return isEpsg(crs) ? crs : `EPSG:${crs.match(/\d+/)[0]}`;
 }
 
@@ -28,6 +40,7 @@ function is4326(crs) {
 }
 
 function isGeocentric(crs) {
+    mustBeString(crs);
     const projection = proj4.defs(crs);
     return !projection ? false : projection.projName == 'geocent';
 }
@@ -43,6 +56,7 @@ function _unitFromProj4Unit(projunit) {
 }
 
 function toUnit(crs) {
+    mustBeString(crs);
     switch (crs) {
         case 'EPSG:4326' : return UNIT.DEGREE;
         case 'EPSG:4978' : return UNIT.METER;
@@ -57,9 +71,10 @@ function toUnit(crs) {
 }
 
 function toUnitWithError(crs) {
+    mustBeString(crs);
     const u = toUnit(crs);
-    if (crs === undefined || u === undefined) {
-        throw new Error(`Invalid crs parameter value '${crs}'`);
+    if (u === undefined) {
+        throw new Error(`No unit found for crs: '${crs}'`);
     }
     return u;
 }
diff --git a/src/Source/TMSSource.js b/src/Source/TMSSource.js
index dd5ff12bce..b86301f714 100644
--- a/src/Source/TMSSource.js
+++ b/src/Source/TMSSource.js
@@ -14,7 +14,7 @@ const extent = new Extent(CRS.tms_4326, 0, 0, 0);
  * @extends Source
  *
  * @property {boolean} isTMSSource - Used to checkout whether this source is a
- * TMSSource. Default is tue. You should not change this, as it is used
+ * TMSSource. Default is true. You should not change this, as it is used
  * internally for optimisation.
  * @property {boolean} isInverted - The isInverted property is to be set to the
  * correct value, true or false (default being false) if the computation of the