Use same http options as pak/pkgcache

In particular the path to the CA bundle, for
r-lib/pak#693.

R/http.R

@@ -1,3 +1,21 @@
+get_default_curl_options <- function(options) {
+  getopt <- function(nm) {
+    if (!is.null(v <- options[[nm]])) return(v)
+    anm <- paste0("async_http_", nm)
+    if (!is.null(v <- getOption(anm))) return(v)
+    if (!is.na(v <- Sys.getenv(toupper(anm), NA_character_))) return (v)
+  }
+  modifyList(
+    options,
+    drop_nulls(list(
+      timeout = as.integer(getopt("timeout") %||% 0),
+      connecttimeout = as.integer(getopt("connecttimeout") %||% 300),
+      low_speed_time = as.integer(getopt("low_speed_time") %||% 0),
+      low_speed_limit = as.integer(getopt("low_speed_limit") %||% 0),
+      cainfo = getopt("cainfo")
+    ))
+  )
+}
 
 http_get <- function(url) {
   curl::curl_fetch_memory(url)

R/utils.R

@@ -80,9 +80,9 @@ contains <- function(x, y) y %in% x
 isin <- function(x, y) x %in% y
 
 remove_special <- function(list, level = 1) {
-  
+
   assert_that(is_positive_count(level))
-  
+
   if (level == 1) {
     replace(
       grepl(pattern = "^_", names(list)),
@@ -92,7 +92,7 @@ remove_special <- function(list, level = 1) {
   } else {
     lapply(list, remove_special, level = level - 1)
   }
-  
+
 }
 
 pluck <- function(list, idx) list[[idx]]
@@ -104,25 +104,25 @@ needs_packages <- function(pkgs) {
 
   if (!all(has)) {
     not_installed_pkgs <- pkgs[!has]
-    
+
     if (length(not_installed_pkgs) == 1) {
-      
+
       throw(new_error(
         "The ",
         sQuote(not_installed_pkgs),
         " package is needed for this addin.",
         call. = FALSE
       ))
     } else {
-      
+
       throw(new_error(
         "The ",
         paste(sQuote(not_installed_pkgs), collapse = ", "),
         " packages are needed for this addin.",
         call. = FALSE
       ))
     }
-    
+
   }
 }
 
@@ -133,3 +133,7 @@ clean_description <- function(txt) {
 zap_null <- function(x) {
   x[! map_lgl(x, is.null)]
 }
+
+drop_nulls <- function (x) {
+  x[!map_lgl(x, is.null)]
+}