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diff --git a/.gitignore b/.gitignore new file mode 100644 index 0000000..16ece6b --- /dev/null +++ b/.gitignore @@ -0,0 +1,6 @@ +# -*- conf -*- + +# Editor backup files +*~ +\#* +.\#* @@ -0,0 +1,202 @@ + + Apache License + Version 2.0, January 2004 + http://www.apache.org/licenses/ + + TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION + + 1. Definitions. + + "License" shall mean the terms and conditions for use, reproduction, + and distribution as defined by Sections 1 through 9 of this document. + + "Licensor" shall mean the copyright owner or entity authorized by + the copyright owner that is granting the License. + + "Legal Entity" shall mean the union of the acting entity and all + other entities that control, are controlled by, or are under common + control with that entity. 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We also recommend that a + file or class name and description of purpose be included on the + same "printed page" as the copyright notice for easier + identification within third-party archives. + + Copyright [yyyy] [name of copyright owner] + + 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. 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 @@ -0,0 +1,6 @@ +library $/crypto-hash-openssl +allow url https://secure.gravatar.com/avatar/* + +$/list +$/string +gravatar
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