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-rw-r--r--.gitignore6
-rw-r--r--LICENSE202
-rw-r--r--gravatar.ur99
-rw-r--r--gravatar.urs60
-rw-r--r--lib.urp6
5 files changed, 373 insertions, 0 deletions
diff --git a/.gitignore b/.gitignore
new file mode 100644
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--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,6 @@
+# -*- conf -*-
+
+# Editor backup files
+*~
+\#*
+.\#*
diff --git a/LICENSE b/LICENSE
new file mode 100644
index 0000000..d645695
--- /dev/null
+++ b/LICENSE
@@ -0,0 +1,202 @@
+
+ Apache License
+ Version 2.0, January 2004
+ http://www.apache.org/licenses/
+
+ TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
+
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diff --git a/gravatar.ur b/gravatar.ur
new file mode 100644
index 0000000..2ecbdde
--- /dev/null
+++ b/gravatar.ur
@@ -0,0 +1,99 @@
+(* Copyright 2015 the Massachusetts Institute of Technology
+
+Licensed under the Apache License, Version 2.0 (the "License"); you may not use
+this file except in compliance with the License. You may obtain a copy of the
+License at
+
+ http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software distributed
+under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR
+CONDITIONS OF ANY KIND, either express or implied. See the License for the
+specific language governing permissions and limitations under the License. *)
+
+fun separate_with (sep : string) (xs : list string) : string =
+ List.foldr (fn result x => case x of
+ "" => result
+ | _ => strcat x (strcat sep result))
+ ""
+ xs
+
+structure Options = struct
+ datatype missing_image_response =
+ FourOhFour
+ | MysteryMan
+ | Identicon
+ | Monster
+ | Wavatar
+ | Retro
+ | Blank
+ | Url of url
+
+ val show_missing_image_response : show missing_image_response =
+ mkShow (fn r =>
+ case r of
+ FourOhFour => "404"
+ | MysteryMan => "mm"
+ | Identicon => "identicon"
+ | Monster => "monsterid"
+ | Wavatar => "wavatar"
+ | Retro => "retro"
+ | Blank => "blank"
+ | Url u => show u)
+
+ datatype rating = G | PG | R | X
+
+ val show_rating : show rating =
+ mkShow (fn r =>
+ case r of
+ G => "g"
+ | PG => "pg"
+ | R => "r"
+ | X => "x")
+
+ type t = {
+ Size : option int,
+ Default : option missing_image_response,
+ ForceDefault : bool,
+ Rating : option rating
+ }
+
+ (* Converts a possibly null value to a component in an HTTP query string. *)
+ fun parameter_string [a] (show_a : show a)
+ (url_key : string) (value : option a)
+ : string =
+ case value of
+ None => ""
+ | Some v => strcat url_key (strcat "=" (@show show_a v))
+
+ (* Generates a list of the components in the HTTP query string corresponding
+ to [options]. *)
+ fun query_string_elements (options : t) : list string =
+ parameter_string "s" options.Size
+ :: parameter_string "d" options.Default
+ :: (case options.ForceDefault of
+ False => ""
+ | True => "f=y")
+ :: parameter_string "r" options.Rating
+ :: []
+
+ fun to_query_string (options : t) : string =
+ case (separate_with "&" (query_string_elements options)) of
+ "" => ""
+ | query_string =>
+ (* Hey, we got some. Stick a "?" at the beginning so it can be used
+ as a query string. *)
+ strcat "?" query_string
+ end
+
+fun calculate_hash email =
+ show (Hash.md5 (textBlob (String.mp tolower (String.trim email))))
+
+fun url' options email =
+ bless
+ (strcat "https://secure.gravatar.com/avatar/"
+ (strcat (calculate_hash email)
+ (Options.to_query_string options)))
+
+fun url email =
+ url' {Size = None, Default = None, ForceDefault = False, Rating = None} email
diff --git a/gravatar.urs b/gravatar.urs
new file mode 100644
index 0000000..3f922ec
--- /dev/null
+++ b/gravatar.urs
@@ -0,0 +1,60 @@
+(* Copyright 2015 the Massachusetts Institute of Technology
+
+Licensed under the Apache License, Version 2.0 (the "License"); you may not use
+this file except in compliance with the License. You may obtain a copy of the
+License at
+
+ http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software distributed
+under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR
+CONDITIONS OF ANY KIND, either express or implied. See the License for the
+specific language governing permissions and limitations under the License. *)
+
+(* Given an e-mail address, converts it to a Gravatar URL. The URL points to an
+80px by 80px image containing the avatar associated with the e-mail address, or
+the blue Gravatar logo if no such avatar exists. The result URL is an HTTPS
+URL, so it won't cause any issues with use on a page served via HTTPS.
+
+This is a specialized form of [url']. *)
+val url : string -> url
+
+structure Options : sig
+ (* How Gravatar will respond if the avatar does not exist. *)
+ datatype missing_image_response =
+ FourOhFour (* by returning a 404 Not Found *)
+ | MysteryMan (* by returning a silhouetted outline of a person *)
+ | Identicon (* by producing a geometric pattern *)
+ | Monster (* by generating a MS-Paint-esque monster *)
+ | Wavatar (* by generating a MS-Paint-esque face *)
+ | Retro (* by generating an 8-bit arcade-style 'alien' (think Galaga) *)
+ | Blank (* by returning a transparent PNG *)
+ | Url of url (* by returning the specified URL *)
+
+ (* How mature your audience is. Gravatar will censor images rated more
+ maturely than you specify. *)
+ datatype rating = G | PG | R | X
+
+ (* Option struct to pass to [url']. If a field is [None], Gravatar's API
+ specifies the default, which may change as Gravatar's API updates. *)
+ type t = {
+ (* The size of the image, in pixels. Images are square, so you need
+ specify only one dimension. *)
+ Size : option int,
+
+ (* How Gravatar will respond if the avatar does not exist. [None] here
+ indicates an option unavailable in the [missing_image_response] type,
+ namely the Gravatar logo. *)
+ Default : option missing_image_response,
+
+ (* If for some reason you want Gravatar to pretend the avatar does not
+ exist, you can set this to [True]. *)
+ ForceDefault : bool,
+
+ (* How mature your audience is. *)
+ Rating : option rating
+ }
+end
+
+(* Like [url], but allows you to specify options. *)
+val url' : Options.t -> string -> url
diff --git a/lib.urp b/lib.urp
new file mode 100644
index 0000000..ebecf63
--- /dev/null
+++ b/lib.urp
@@ -0,0 +1,6 @@
+library $/crypto-hash-openssl
+allow url https://secure.gravatar.com/avatar/*
+
+$/list
+$/string
+gravatar \ No newline at end of file