[WIP] print proxy blog post #369
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steveoh
reviewed
Feb 2, 2017
| This is most commonly used as a print service for web applications allowing the user to download a PDF of the current map extent. | ||
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| ### The Problem | ||
| AGRC's [base map services](https://gis.utah.gov/data/base-map-and-imagery/) (including the [Google imagery](https://gis.utah.gov/data/google-imagery-license/)) are hosted as WMTS services on `discover.agrc.utah.gov`. In order to use them an organization needs to [register](https://gis.utah.gov/data/base-map-and-imagery/) and request a quad word. To prevent unauthorized use they are each locked down to a specific domain or set of domains. So if someone tries to use your quad word from any other domain or server the request is blocked. This all works well until you send a web map to the PrintingTools service in ArcGIS Server. The web map contains URL's to discover services that have quad words locked down to your web app's domain. When the service requests tiles, it does so from the server that is hosting the service not the browser. This causes discover to reject the request because the origin of the request does not match what the quad word is locked down to. |
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any link to within gis.utah.gov should use a relative url and the liquid templating with the base url. See the readme for examples.
steveoh
reviewed
Feb 2, 2017
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| _Why don't I just use a wide open quad word in the first place?_ That's a great question. I'm glad you asked! Using wide open quad words in web applications would violate the [Organizational Usage Agreement](https://docs.google.com/a/utah.gov/forms/d/e/1FAIpQLScL5uUQIvw7op_ZcF4bijxcoOMGhNF0MXwJNGqSXS6IbjbKhA/viewform). It would be very easy for a savvy web developer to get your quad words and use them on their own site. | ||
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| AGRC's print proxy service is open source and available for download and deployment to your own servers from: https://github.com/agrc/print-proxy. Feedback and pull requests are welcome. |
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Not bad! |
steveoh
requested changes
Feb 2, 2017
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fix up the links and if you want to fool with http://www.hemingwayapp.com/ go for it. Otherwise I think this is pretty cool
steveoh
reviewed
Feb 2, 2017
| ### The Solution | ||
| To work around this issue AGRC developed a [print-proxy geoprocessing service](https://github.com/agrc/print-proxy). This service accepts the same parameters as Export Web Map with the addition of `ExportWebMapService_URL` which defines the Export Web Map Service that you want to proxy to. Then within the service, it simply switches out your locked down quad-word for a wide open one and passes the request onto the URL defined in `ExportWebMapService_URL`. | ||
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| _Why don't I just use a wide open quad word in the first place?_ That's a great question. I'm glad you asked! Using wide open quad words in web applications would violate the [Organizational Usage Agreement](https://docs.google.com/a/utah.gov/forms/d/e/1FAIpQLScL5uUQIvw7op_ZcF4bijxcoOMGhNF0MXwJNGqSXS6IbjbKhA/viewform). It would be very easy for a savvy web developer to get your quad words and use them on their own site. |
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I think it is a good idea to not tell people what they can do with the unregulated quad word. We don't need to give people ideas but this benign use case seems acceptable.
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So I'm not clear; should I remove this sentence?
steveoh
requested changes
Feb 3, 2017
| layout: post | ||
| status: publish | ||
| published: true | ||
| title: 'Using discover.agrc.utah.gov Services PrintingTools/Export Web Map Service' |
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I think we should shorten this title to something like 'Printing Web Maps with Discover Services'
| email: stdavis@utah.gov | ||
| date: 2017-02-02 21:04:30 | ||
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OK. This looks good to me. I'd just like to get this reviewed by @rkelson before it gets merged... |
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This is just the first draft. Feedback is welcome.