Getting OAuth settings from env var with full stop in key - docker

Question

I am using docker linux container to run my servicestack application and I need to be able to read the OAuth keys from environment variables defined in my docker-compose.yml.
It appears impossible to do this due to the full stop in the variable name.
For example in OAuthProvider.cs (https://github.com/ServiceStack/ServiceStack/blob/master/src/ServiceStack/Auth/OAuthProvider.cs) line 26:
this.ConsumerKey = appSettings.GetString($"oauth.{oAuthProvider}.{consumerKeyName}");
It is reading for example the key oauth.google.ConsumerKey.
Linux doesn't support full stops in environment variables. Using the debugger I can see that if I put the variables in like:
environment:
- oauth.RedirectUrl=http://example.com
- oauth.CallbackUrl=http://example.com/auth/{0}
- oauth.basecamp.ConsumerKey=fgshghfdhfghgfdhf
- oauth.basecamp.ConsumerSecret=fdghfdghdfghgdfhdfghfgd
Then they are removed. I did some research and this is common issue, if the env var has a full stop then it gets removed. I cannot find any workaround for this.
Do you have any idea how I can pass these hard coded settings with docker environment variable?
Here is representation of my entire dockerfile for reference:
ARG BUILD_MODE=Release
FROM mcr.microsoft.com/dotnet/core/aspnet:3.1-buster-slim AS base
RUN apt-get update && apt-get install openssh-server unzip -y
RUN curl -sSL https://aka.ms/getvsdbgsh | /bin/sh /dev/stdin -v latest -l ~/vsdbg
COPY sshd_config /etc/ssh/
WORKDIR /app
EXPOSE 80
EXPOSE 443
FROM mcr.microsoft.com/dotnet/core/sdk:3.1-buster AS build
WORKDIR /src
COPY ["Project/Project.csproj", "Project/"]
COPY ["Project.ServiceModel/Project.ServiceModel.csproj", "Project.ServiceModel/"]
COPY ["Project.ServiceInterface/Project.ServiceInterface.csproj", "Project.ServiceInterface/"]
COPY ["NuGet.config", "NuGet.config"]
RUN dotnet restore "Project/Project.csproj"
COPY . .
WORKDIR "/src/Project"
RUN dotnet build "Project.csproj" -c "$BUILD_MODE" -o /app/build
FROM build AS publish
RUN dotnet publish "Project.csproj" -c "$BUILD_MODE" -o /app/publish
FROM base AS final
WORKDIR /app
COPY --from=publish /app/publish .
ENTRYPOINT service ssh start && echo "root:$SSH_PASSWORD" | chpasswd && dotnet Project.dll
And this is docker-compose:
version: "3.7"
services:
project:
build:
context: E:\project\
dockerfile: E:\project\project\Dockerfile
image: project:local
ports:
- "57008:80"
- "57009:443"
- "57001:2222"
restart: always
depends_on:
- "db"
environment:
- oauth.RedirectUrl=http://example.com
- oauth.CallbackUrl=http://example.com/auth/{0}
- oauth.basecamp.ConsumerKey=fgshghfdhfghgfdhf
- oauth.basecamp.ConsumerSecret=fdghfdghdfghgdfhdfghfgd
db:
image: postgres:10.9
restart: always
environment:
POSTGRES_PASSWORD: fdgdfgdfgdf
POSTGRES_USER: project
ports:
- "5445:5432"

Answer 1

You can provide your own custom AppSettings provider or use the DictionarySettings and populate it with a mapped environment variable that's suitable to use in Docker, e.g:
Use underscore separators in Docker:
environment:
- oauth_RedirectUrl=http://example.com
- oauth_CallbackUrl=http://example.com/auth/{0}
- oauth_basecamp_ConsumerKey=fgshghfdhfghgfdhf
- oauth_basecamp_ConsumerSecret=fdghfdghdfghgdfhdfghfgd
Then create a new Dictionary AppSettings using the keys ServiceStack expects, e.g:
string env(string key) =>
Environment.GetEnvironmentVariable(key.Replace(".","_"));
var envSettings = new DictionarySettings(new Dictionary<string,string> {
["oauth.RedirectUrl"] = env("oauth.RedirectUrl"),
["oauth.CallbackUrl"] = env("oauth.CallbackUrl"),
["oauth.basecamp.ConsumerKey"] = env("oauth.basecamp.ConsumerKey"),
["oauth.basecamp.ConsumerSecret"] = env("oauth.basecamp.ConsumerSecret"),
});
Then use that in your Auth Providers, e.g:
new MyAuthProvider(envSettings)