Provide support for arbitrary file extensions within Dash for R component libraries

.circleci/config.yml

@@ -37,7 +37,7 @@ jobs:
           command: |
             python -m venv venv
             . venv/bin/activate
-            git clone --depth 1 https://github.com/plotly/dash.git dash-main
+            git clone -b 481-arbitrary-extensions --depth 1 https://github.com/plotly/dash.git dash-main
             cd dash-main && pip install -e .[dev,testing] --progress-bar off && cd ..
             cd dash-main/\@plotly/dash-generator-test-component-nested && npm ci && npm run build && sudo R CMD INSTALL . && cd ../../..
             cd dash-main/\@plotly/dash-generator-test-component-standard && npm ci && npm run build && sudo R CMD INSTALL . && cd ../../..

CHANGELOG.md

@@ -4,6 +4,7 @@ All notable changes to this project will be documented in this file.
 ## Unreleased
 ### Added
 - Support for inline clientside callbacks in JavaScript [#140](https://github.com/plotly/dashR/pull/140)
+- Support for arbitrary file extensions for assets within component libraries [#186](https://github.com/plotly/dashR/pull/186)
 
 ## [0.3.0] - 2020-02-12
 ### Added
@@ -53,8 +54,8 @@ All notable changes to this project will be documented in this file.
 - Initial release
     - Support for `plot_ly` and `ggplotly` "subplots" [#84](https://github.com/plotly/dashR/pull/84)
     - Improved debugging support [#87](https://github.com/plotly/dashR/pull/87), including Dash Dev Tools and `debug` mode
-    - Provide a useful warning message when JS dependencies cannot be found [#81](https://github.com/plotly/dashR/pull/81)    
-    - Support for externalized PropTypes introduced 
+    - Provide a useful warning message when JS dependencies cannot be found [#81](https://github.com/plotly/dashR/pull/81)
+    - Support for externalized PropTypes introduced
     - Support for `callback_context` added
     - Options to set `dev_tools_ui` and `dev_tools_props_check` added
 
@@ -69,11 +70,11 @@ All notable changes to this project will be documented in this file.
 
 ### Fixed
 - CSS dependencies are now properly loaded [#94](https://github.com/plotly/dashR/pull/94)
-    
-    
+
+
 ## [0.0.7] - 2019-04-09
 ### Removed
-- `dependencies_set`, `dependencies_get`, and `dependencies_get_internal` methods removed from package 
+- `dependencies_set`, `dependencies_get`, and `dependencies_get_internal` methods removed from package
 
 
 ### [0.0.6] - 2019-04-08
@@ -107,9 +108,9 @@ All notable changes to this project will be documented in this file.
 
 ### [0.0.3] - 2019-03-08
 ### Added
-- `assert_valid_callbacks` to validate callback handler definitions and ordering of `input` and `state` using 
+- `assert_valid_callbacks` to validate callback handler definitions and ordering of `input` and `state` using
   new `valid_seq` function
-    
+
 ### Changed
 - Callback method and handling refactored to match current Dash for Python API [#51](https://github.com/plotly/dashR/pull/51)
 - Handler function for callbacks now passed via `func` argument to `app$callback()`

R/dash.R

@@ -560,11 +560,27 @@ Dash <- R6::R6Class(
           # if debug mode is not active
           dep_path <- system.file(dep_pkg$rpkg_path,
                                   package = dep_pkg$rpkg_name)
+
+          response$type <- get_mimetype(filename)
 
-          response$body <- readLines(dep_path,
-                                     warn = FALSE,
-                                     encoding = "UTF-8")
-
+          if (grepl("text|javascript", response$type)) {
+            response$body <- readLines(dep_path,
+                                       warn = FALSE,
+                                       encoding = "UTF-8")
+
+            if (private$compress && length(response$body) > 0) {
+              response <- tryCompress(request, response)
+            }
+          } else {
+            file_handle <- file(dep_path, "rb")
+            file_size <- file.size(dep_path)
+
+            response$body <- readBin(dep_path,
+                                     raw(),
+                                     file_size)
+            close(file_handle)
+          }          
+
           if (!private$debug && has_fingerprint) {
             response$status <- 200L
             response$set_header('Cache-Control',
@@ -587,13 +603,8 @@ Dash <- R6::R6Class(
           } else {
             response$status <- 200L
           }
-
-          response$type <- get_mimetype(filename)
         }
 
-        if (private$compress && length(response$body) > 0)
-          response <- tryCompress(request, response)
-
         TRUE
       })
 
@@ -629,8 +640,7 @@ Dash <- R6::R6Class(
         # and opens/closes a file handle if the type is assumed to be binary
         if (!(is.null(asset_path)) && file.exists(asset_path)) {
           response$type <- request$headers[["Content-Type"]] %||%
-            mime::guess_type(asset_to_match,
-                             empty = "application/octet-stream")
+            get_mimetype(asset_to_match)
 
           if (grepl("text|javascript", response$type)) {
             response$body <- readLines(asset_path,

R/utils.R

@@ -315,9 +315,9 @@ assert_no_names <- function (x)
 # filtered out by the subsequent vapply statement
 clean_dependencies <- function(deps) {
   dep_list <- lapply(deps, function(x) {
-    if (is.null(x$src$file) | (is.null(x$script) & is.null(x$stylesheet)) | (is.null(x$package))) {
+    if (is.null(x$src$file) | (is.null(x$script) & is.null(x$stylesheet) & is.null(x$other)) | (is.null(x$package))) {
       if (is.null(x$src$href))
-        stop(sprintf("Script or CSS dependencies with NULL href fields must include a file path, dependency name, and R package name."), call. = FALSE)
+        stop(sprintf("Script, CSS, or other dependencies with NULL href fields must include a file path, dependency name, and R package name."), call. = FALSE)
       else
         return(NULL)
     }
@@ -504,7 +504,9 @@ get_package_mapping <- function(script_name, url_package, dependencies) {
       dep_path <- file.path(x$src$file, x$script)
     else if (!is.null(x$stylesheet))
       dep_path <- file.path(x$src$file, x$stylesheet)
-
+    else if (!is.null(x$other))
+      dep_path <- file.path(x$src$file, x$other)
+
     # remove n>1 slashes and replace with / if present;
     # htmltools seems to permit // in pathnames, but
     # this complicates string matching unless they're
@@ -531,17 +533,17 @@ get_package_mapping <- function(script_name, url_package, dependencies) {
 }
 
 get_mimetype <- function(filename) {
-  # the tools package is available to all
-  filename_ext <- file_ext(filename)
+  filename_ext <- getFileExt(filename)
 
   if (filename_ext == 'js')
     return('application/JavaScript')
   else if (filename_ext == 'css')
     return('text/css')
-  else if (filename_ext == 'map')
+  else if (filename_ext %in% c('js.map', 'map'))
     return('application/json')
   else
-    return(NULL)
+    return(mime::guess_type(filename, 
+                            empty = "application/octet-stream"))
 }
 
 generate_css_dist_html <- function(href,

tests/integration/test_generation.py

@@ -1,6 +1,5 @@
 from selenium.webdriver.support.select import Select
-import time, os
-
+from selenium.webdriver.support.ui import WebDriverWait
 
 app = """
 library(dash)
@@ -17,9 +16,53 @@
 app$run_server()
 """
 
+styled_app = """
+library(dash)
+library(dashHtmlComponents)
+library(dashGeneratorTestComponentStandard)
+
+app <- Dash$new()
+app$layout(htmlDiv(list(
+    htmlButton(id='btn', list('Click')),
+    htmlDiv(id='container')
+)))
+
+app$callback(output(id = 'container', property = 'children'),
+    list(input(id = 'btn', property = 'n_clicks')),
+    function(n_clicks) {
+        if (is.null(unlist(n_clicks))) {
+            return(dashNoUpdate())
+        } else {
+            return(list(dgtc_standardMyStandardComponent(id="standard", value="Standard", style=list(fontFamily="godfather"))))
+        }
+    })
+
+app$run_server()
+"""
+
 
 def test_gene001_simple_callback(dashr):
     dashr.start_server(app)
 
     assert dashr.wait_for_element("#standard").text == "Standard"
-    assert dashr.wait_for_element("#nested").text == "Nested"
+    assert dashr.wait_for_element("#nested").text == "Nested"
+
+    dashr.percy_snapshot("gene001-simple-callback")
+
+
+def test_gene002_arbitrary_resources(dashr):
+    dashr.start_server(styled_app)
+
+    assert (
+        dashr.driver.execute_script("return document.fonts.check('1em godfather')")
+        is False
+    )
+
+    dashr.wait_for_element("#btn").click()
+    assert dashr.wait_for_element("#standard").text == "Standard"
+
+    WebDriverWait(dashr.driver, 10).until(
+        lambda _: dashr.driver.execute_script("return document.fonts.check('1em godfather')") is True,
+    )
+
+    dashr.percy_snapshot("gene002-arbitrary-resource")