From 40281d0f1e3b4e4d712265ebb0bafb60af9436b2 Mon Sep 17 00:00:00 2001
From: Fons van der Plas <fons@plutojl.org>
Date: Mon, 5 Feb 2024 11:04:25 +0100
Subject: [PATCH] Use data URL for local plotly asset (#4863)

* Use data URL for local plotly asset

* formatting

* fix: reviewdog suggestion

---------

Co-authored-by: Panagiotis Georgakopoulos <panagiotis.georgakopoulos@juliacomputing.com>
---
 src/backends/plotly.jl | 2 +-
 src/init.jl            | 8 ++++++++
 2 files changed, 9 insertions(+), 1 deletion(-)

diff --git a/src/backends/plotly.jl b/src/backends/plotly.jl
index 1c251c639..12f81ad60 100644
--- a/src/backends/plotly.jl
+++ b/src/backends/plotly.jl
@@ -1055,7 +1055,7 @@ html_body(plt::Plot{PlotlyBackend}) = plotly_html_body(plt)
 
 plotly_url() =
     if _use_local_dependencies[]
-        "file:///" * _plotly_local_file_path[]
+        _plotly_data_url()
     else
         "https://cdn.plot.ly/$_plotly_min_js_filename"
     end
diff --git a/src/init.jl b/src/init.jl
index b962a843f..b7738e3f9 100644
--- a/src/init.jl
+++ b/src/init.jl
@@ -1,7 +1,15 @@
 using Scratch
 using REPL
+import Base64
 
 const _plotly_local_file_path = Ref{Union{Nothing,String}}(nothing)
+const _plotly_data_url_cached = Ref{Union{Nothing,String}}(nothing)
+_plotly_data_url() =
+    if _plotly_data_url_cached[] === nothing
+        _plotly_data_url_cached[] = "data:text/javascript;base64,$(Base64.base64encode(read(_plotly_local_file_path)))"
+    else
+        _plotly_data_url_cached[]
+    end
 # use fixed version of Plotly instead of the latest one for stable dependency
 # see github.com/JuliaPlots/Plots.jl/pull/2779
 const _plotly_min_js_filename = "plotly-2.6.3.min.js"